C8051F800-DK
C8051F800 D E V E L O P M E N T K I T U SER ’ S G UIDE
1. Relevant Devices
The C8051F800 Development Kit is intended as a development platform for the microcontrollers in the
C8051F80x-83x MCU family. The members of this MCU family are as follows: C8051F800, C8051F801,
C8051F802, C8051F803, C8051F804, C8051F805, C8051F806, C8051F807, C8051F808, C8051F809,
C8051F810, C8051F811, C8051F812, C8051F813, C8051F814, C8051F815, C8051F816, C8051F817,
C8051F818, C8051F819, C8051F820, C8051F821, C8051F822, C8051F823, C8051F824, C8051F825,
C8051F826, C8051F827, C8051F828, C8051F829, C8051F830, C8051F831, C8051F832, C8051F833,
C8051F834, and C8051F835.
The target board included in this kit is provided with a pre-soldered C8051F800-GM MCU (QFN20 package).
Code developed on the C8051F800 can be easily ported to the other members of this MCU family.
Refer to the C8051F80x-83x data sheet for the differences between the members of this MCU family.
The C8051F80x-GM and C8051F81x-GM devices (QFN20 package) are pin-compatible with the C8051F330/1/
2/3/4/5/6/7 devices.
2. Kit Contents
The C8051F800 Development Kit contains the following items:
C8051F800 Target Board
C8051Fxxx Development Kit Quick-Start Guide
Silicon Labs IDE and Product Information CD-ROM. CD content includes the following:
Silicon
Labs Integrated Development Environment (IDE)
assembler, compiler, and linker tools
Source code examples and register definition files
Documentation
Evaluation
Optional Third Party Tools CD
AC to DC Power Adapter
USB Debug Adapter
Two USB Cables
3. Hardware Setup
Refer to Figure 1 for a diagram of the hardware configuration.
1. Connect the USB Debug Adapter to the DEBUG connector on the target board with the 10-pin ribbon cable.
2. Connect one end of the USB cable to the USB connector on the USB Debug Adapter.
3. Verify that shorting blocks are installed on the target board as shown in Figure 4 on page 8.
4. Connect the other end of the USB cable to a USB Port on the PC.
5. Connect the ac/dc power adapter to power jack P4 on the target board.
Notes:
Use the Reset icon in the IDE to reset the target when connected during a debug session.
Remove power from the target board and the USB Debug Adapter before connecting or disconnecting the
ribbon cable from the target board. Connecting or disconnecting the cable when the devices have power can
damage the device and/or the USB Debug Adapter.
Rev. 0.2 7/13
Copyright © 2013 by Silicon Laboratories
C8051F800-DK
C8051F800-DK
PC
Target Board
P1.4
P1.6
P1.0
P1.1
P1.2
P1.3
P1.4
P0.4
P0.5
P1.5
P1.6
D4
F326
DEBUG
+3VD
GND
P0.0/VREF
P0.1
GND
J10
GND
P0.1
P1.1
P0.6/CNVSTR
XTAL2
SILICON LABS
VDD
J2
P0.0
P0.0/VREF
GND
RST
www.silabs.com
P1.7
P1.5
P1.3
U1 F800
P1.1
P0.7
P0.5
P0.3_J9
XTAL1
P0.1
P0.2_J8
+3VD P0.3_J9
J9
J8
P1.0
Prototype Area
J1
GND
P2.0
P1.6
P1.4
P1.2
P1.0
P0.6
P0.4
P0.2_J8
P0.0
+3VD
USB Debug
Adapter
COMM
USB
J4
J5
POWER
Power
J7J6
RESET
J3
Run
P1.0_LED
D10
P1.0_LED
P1.1_LED
P1.1_LED P1.2_LED
D9
P1.3_LED
P1.4_SW
P1.2_LED TX_MCU
D8
RX_MCU
RTS
P1.3_LED
CTS
D7
USB
Cable
Stop
C8051F800-TB
+3VD
P0.7
P1.5
R14
Silicon Laboratories
USB DEBUG ADAPTER
CAPACITIVE SENSE
P1
AC/DC
Adapter
PWR
D6
TB1
Figure 1. Hardware Setup using a USB Debug Adapter
4. Software Setup
The included CD-ROM contains the Silicon Labs Integrated Development Environment (IDE), evaluation 8051
tools, optional software utilities, and additional documentation. Insert the CD-ROM into your PC’s CD-ROM drive.
An installer will automatically launch, allowing you to install the IDE software or read documentation by clicking
buttons on the Installation Panel. If the installer does not automatically start when you insert the CD-ROM, run
autorun.exe found in the root directory of the CD-ROM. Refer to the ReleaseNotes.txt file on the CD-ROM for the
latest information regarding known problems and restrictions.
4.1. System Requirements
The following are the system requirements necessary to run the debug and programming tools:
Pentium-class host PC running Microsoft Windows 2000 or newer.
One available USB port.
4.2. Development Tools Installation
To install the IDE, utilities, and code examples, perform the following steps:
1. Click on the "Install Development Tools" button on the installation utility's startup screen.
2. In the Kit Selection box that appears, choose the C8051F800-DK development kit from the list of options.
3. In the next screen, choose “Components to be Installed”. The programs necessary to download and debug on
the MCU are the Silicon Labs IDE and the Keil 8051 Evaluation Toolset. The CP210x Drivers are necessary
to use the UART capabilities of the target board. See Section 4.3. for more information about installing the
CP210x drivers.
4. Installers selected in Step 3 will execute in sequence, prompting the user as they install programs,
documentation, and drivers.
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C8051F800-DK
4.3. CP210x USB to UART VCP Driver Installation
The C8051F800 Target Board includes a Silicon Labs CP2103 USB-to-UART Bridge Controller. Device drivers for
the CP2103 need to be installed before PC software such as HyperTerminal can communicate with the target
board over the USB connection. If the "Install CP210x Drivers" option is selected during installation, a driver
“unpacker” utility will launch.
1. Follow the steps to copy the driver files to the desired location. The default directory is C:\SiLabs\MCU\CP210x.
2. The final window will give an option to install the driver on the target system. Select the “Launch the CP210x
VCP Driver Installer” option if you are ready to install the driver.
3. If selected, the driver installer will now launch, providing an option to specify the driver installation location. After
pressing the “Install” button, the installer will search your system for copies of previously installed CP210x
Virtual COM Port drivers. It will let you know when your system is up to date. The driver files included in this
installation have been certified by Microsoft.
4. If the “Launch the CP210x VCP Driver Installer” option was not selected in step 3, the installer can be found in
the location specified in step 2, by default C:\SiLabs\MCU\CP210x\Windows_2K_XP_S2K3_Vista. At this
location, run CP210xVCPInstaller.exe.
5. To complete the installation process, connect the included USB cable between the host computer and the USB
connector (P5) on the C8051F800 Target Board. Windows will automatically finish the driver installation.
Information windows will pop up from the taskbar to show the installation progress.
6. If needed, the driver files can be uninstalled by selecting “Silicon Labs CP210x USB to UART Bridge Driver
Removal” option in the “Add or Remove Programs” window.
5. Software Overview
The following software is necessary to build a project, download code to, and communicate with the target
microcontroller.
Silicon Labs Integrated Development Environment (IDE)
8051 Toolset
Other useful software that is provided on the development kit CD and the Silicon Labs Downloads
(www.silabs.com/mcudownloads) website includes:
Configuration Wizard 2
Keil µVision2 and µVision3 Drivers
MCU Production Programmer and Flash Programming Utilities
5.1. Silicon Labs IDE
The Silicon Labs IDE integrates a source-code editor, source-level debugger and in-system programmer. The use
of third-party compilers, assemblers, and linkers is also supported. This development kit includes evaluation
versions of commercial C compilers and assemblers which can be used from within the Silicon Labs IDE.
5.1.1. Third Party Toolsets
The Silicon Labs IDE has native support for many 8051 compilers. Natively-supported tools are as follows:
Keil
IAR
Raisonance
Tasking
SDCC
Specific instructions for integrating each of the supported tools can be found in the application notes section of the
CD, or on the Silicon Labs website (http://www.silabs.com).
Rev. 0.2
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C8051F800-DK
5.1.2. Getting Started With the Silicon Labs IDE
The following sections discuss how to open an example project in the IDE, build the source code, and download it
to the target device.
5.1.2.1. Running the F800_Blinky example program
The F800_Blinky example program blinks an LED on the target board.
1. Open the Silicon Labs IDE from the Start menu.
2. Select ProjectOpen Project to open an existing project.
3. Browse to the C:\SiLabs\MCU\Examples\C8051F80x_83x\Blinky directory (default) and select the
F800_Blinky_C.wsp project file and click Open.
4. Once the project is open, build the project by clicking on the Build/Make Project button in the toolbar or
selecting ProjectBuild/Make Project from the menu.
Note: After the project has been built the first time, the Build/Make Project command will only build the files
that have been changed since the previous build. To rebuild all files and project dependencies, click on the
Rebuild All button in the toolbar or select ProjectRebuild All from the menu.
5. Before connecting to the target device, several connection options may need to be set. Open the Connection
Options window by selecting OptionsConnection Options... in the IDE menu. First, select the “USB Debug
Adapter” option. Next, the correct “Debug Interface” must be selected. C8051F80x-83x devices use Silicon
Labs “C2” 2-wire debug interface. Once all the selections are made, click the OK button to close the window.
6. Click the Connect button in the toolbar or select DebugConnect from the menu to connect to the device.
7. Download the project to the target by clicking the Download Code button in the toolbar.
Note: To enable automatic downloading if the program build is successful select Enable automatic connect/
download after build in the ProjectTarget Build Configuration dialog. If errors occur during the build
process, the IDE will not attempt the download.
8. Click on the Go button (green circle) in the toolbar or by selecting DebugGo from the menu to start running
the firmware. The LED on the target board will start blinking.
5.1.2.2. Creating a New Project
Use the following steps to create a new projects. Once steps 1–5 in this section are complete, continue at Step 3 in
Section 5.1.2.1.
1. Select ProjectNew Project to open a new project and reset all configuration settings to default.
2. Select FileNew File to open an editor window. Create your source file(s) and save the file(s) with a
recognized extension, such as .c, .h, or .asm, to enable color syntax highlighting.
3. Right-click on “New Project” in the Project Window. Select Add files to project. Select files in the file browser
and click Open. Continue adding files until all project files have been added.
4. For each of the files in the Project Window that you want assembled, compiled and linked into the target build,
right-click on the file name and select Add file to build. Each file will be assembled or compiled as appropriate
(based on file extension) and linked into the build of the absolute object file.
Note: If a project contains a large number of files, the “Group” feature of the IDE can be used to organize.
Right-click on “New Project” in the Project Window. Select Add Groups to project. Add pre-defined groups or
add customized groups. Right-click on the group name and choose Add file to group. Select files to be added.
Continue adding files until all project files have been added.
5. Save the project when finished with the debug session to preserve the current target build configuration, editor
settings and the location of all open debug views. To save the project, select ProjectSave Project As... from
the menu. Create a new name for the project and click on Save.
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C8051F800-DK
5.2. Configuration Wizard 2
The Configuration Wizard 2 is a code generation tool for all of the Silicon Labs devices. Code is generated through
the use of dialog boxes for each of the device's peripherals.
Figure 2. Configuration Wizard 2 Utility
The Configuration Wizard 2 utility helps accelerate development by automatically generating initialization source
code to configure and enable the on-chip resources needed by most design projects. In just a few steps, the wizard
creates complete startup code for a specific Silicon Labs MCU. The program is configurable to provide the output
in C or assembly. For more information, please refer to the Configuration Wizard 2 help available under the Help
menu in Configuration Wizard 2.
For more information, please refer to the Configuration Wizard 2 documentation. The documentation and software
are available from the Downloads webpage (www.silabs.com/mcudownloads).
5.3. Keil µVision2 and µVision3 Silicon Labs Drivers
As an alternative to the Silicon Labs IDE, the µVision debug driver allows the Keil µVision IDE to communicate with
Silicon Labs on-chip debug logic. In-system Flash memory programming integrated into the driver allows for rapidly
updating target code. The µVision IDE can be used to start and stop program execution, set breakpoints, check
variables, inspect and modify memory contents, and single-step through programs running on the actual target
hardware.
For more information, please refer to the µVision driver documentation. The documentation and software are
available from the Downloads webpage (www.silabs.com/mcudownloads).
Rev. 0.2
5
C8051F800-DK
5.4. Programming Utilities
The Silicon Labs IDE is the primary tool for downloading firmware to the MCU during development. There are two
software programming tools that are intended for use during prototyping or in the field: the MCU Production
Programmer and the Flash Programming Utilities. The MCU Production Programmer is installed with the IDE to the
directory C:\Silabs\MCU\Utilities\Production Programmer\ (default). The Flash Programming Utilities can be
optionally installed from the CD and is installed to C:\Silabs\MCU\Utilities\FLASH Programming\ (default).
6. Example Source Code
Example source code and register definition files are provided in the “SiLabs\MCU\Examples\C8051F80x_83x\”
default directory during IDE installation. These files may be used as a template for code development. The
comments in each example file indicate which development tool chains were used when testing. Example
applications include a blinking LED example which configures the green LED on the target board to blink at a fixed
rate. Also included are examples for each of peripherals of the MCU such as the UART.
6.1. Register Definition Files
Register definition files C8051F800.inc, C8051F800_defs.h and compiler_defs.h define all SFR registers and bitaddressable
control/status
bits.
These
files
are
installed
into
the
“SiLabs\MCU\Examples\C8051F80x_83x\Header_Files\” default directory during IDE installation. The register and
bit names are identical to those used in the C8051F80x-83x data sheet.
6.2. Blinking LED Example
The example source files F800_Blinky.asm and F800_Blinky.c installed in the default directory
“SiLabs\MCU\Examples\C8051F80x_83x\Blinky” show examples of several basic C8051F800 functions. These
include disabling the watchdog timer (WDT), configuring the Port I/O crossbar, configuring a timer for an interrupt
routine, initializing the system clock, and configuring a GPIO port pin. When compiled/assembled and linked, this
program flashes the green LED on the C8051F800 Target Board about five times a second using the interrupt
handler with a C8051F800 timer.
6.3. Capacitive Sense Switch Example
The example source file F80x_CS0.c demonstrates the configuration and usage of the capacitive sense switches
labeled P1.5 and P1.6. Refer to the source file for step-by-step instructions to build and test this example. This is
installed in the “SiLabs\MCU\Examples\C8051F80x_83x\CS0” directory by default.
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C8051F800-DK
7. Target Board
The C8051F800 Development Kit includes a target board with a C8051F800-GM device pre-installed for evaluation
and preliminary software development. Numerous input/output (I/O) connections are provided to facilitate
prototyping using the target board. Refer to Figure 3 for the locations of the various I/O connectors. Figure 4 on
page 8 shows the factory default shorting block positions. A summary of the signal names and headers is provided
in Table 5 on page 13.
Power connector (accepts input from 7 to 15 VDC unregulated power adapter)
USB connector (connects to PC for serial communication)
22-pin Expansion I/O connector
MCU power header (VDD)
Port I/O configuration header
DEBUG connector for Debug Adapter interface
Connects pin P0.0 to the VREF bypass capacitors and TB1
Connects the potentiometer (R14) to pin P0.7 and +3VD
Connects pins P0.2 (XTAL1) and P0.3 (XTAL2) to J1
Connects pin P0.1 to GND and TB1
Analog I/O terminal block
Pin 1
CAPACITIVE SENSE
R14
Pin 2
P1.4
C8051F800-TB
P1.0_LED
D10
P1.0_LED
P1.1_LED
P1.1_LED P1.2_LED
D9
P1.3_LED
P1.4_SW
P1.2_LED TX_MCU
D8
RX_MCU
RTS
P1.3_LED
CTS
D7
J7J6
+3VD
P0.7
P1.5
P1.6
Pin 1
RESET
J3
P1.0
P1.1
P1.2
P1.3
P1.4
P0.4
P0.5
P1.5
P1.6
COMM
USB
D4
F326
DEBUG
Pin 2
J1
+3VD
GND
P0.0/VREF
GND
P1.1
J10
GND
P0.1
P0.1
P0.6/CNVSTR
XTAL2
SILICON LABS
P0.0
P0.0/VREF
GND
RST
www.silabs.com
P1.7
P1.5
P1.3
U1 F800
P1.1
P0.7
P0.5
P0.3_J9
XTAL1
P0.1
P0.3_J9
P0.2_J8
+3VD
J9
J8
GND
P2.0
P1.6
P1.4
P1.2
P1.0
P0.6
P0.4
P0.2_J8
P0.0
+3VD
P1.0
Prototype Area
P1
P2
J1
J2
J3
J4
J5
J6, J7
J8, J9
J10
TB1
VDD
J2
J4
J5
POWER
Pin 1
Pin 2
P1
PWR
D6
TB1
Pin 1
Prototype Area I/O Connection Points
Figure 3. C8051F800 Target Board with Pin Numbers
Rev. 0.2
7
C8051F800-DK
7.1. Target Board Shorting Blocks: Factory Defaults
The C8051F800 Target Board comes from the factory with pre-installed shorting blocks on many headers. Figure 4
shows the positions of the factory default shorting blocks. It should be noted that a shorting block on J2 to connect
power to the MCU is required for normal operation.
Pin 1
CAPACITIVE SENSE
P1.4
C8051F800-TB
P1.0_LED
D10
P1.0_LED
P1.1_LED
P1.1_LED P1.2_LED
D9
P1.3_LED
P1.4_SW
P1.2_LED TX_MCU
D8
RX_MCU
RTS
P1.3_LED
CTS
D7
J7J6
+3VD
P0.7
P1.5
R14
Pin 2
P1.6
Pin 1
RESET
J3
P1.0
P1.1
P1.2
P1.3
P1.4
P0.4
P0.5
P1.5
P1.6
COMM
USB
D4
F326
DEBUG
Pin 2
+3VD
GND
P0.0/VREF
P0.1
GND
J10
GND
P0.1
P1.1
P0.6/CNVSTR
XTAL2
SILICON LABS
P0.0
P0.0/VREF
GND
RST
www.silabs.com
P1.7
P1.5
P1.3
U1 F800
P1.1
P0.7
P0.5
P0.3_J9
XTAL1
P0.1
P0.2_J8
+3VD P0.3_J9
J9
J8
P1.0
Prototype Area
J1
GND
P2.0
P1.6
P1.4
P1.2
P1.0
P0.6
P0.4
P0.2_J8
P0.0
+3VD
VDD
J2
J4
J5
POWER
P1
PWR
D6
TB1
Pin 1
Prototype Area I/O Connection Points
Figure 4. C8051F800 Target Board Shorting Blocks: Factory Defaults
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Pin 1
Pin 2
C8051F800-DK
7.2. Target Board Power Options and Current Measurement (P1, P2, J2, J4)
The C8051F800 Target Board supports three power options:
1. 12 VDC power using the AC to DC power adapter (P1)
2. 5 VDC USB VBUS power from PC via the USB Debug Adapter (J4)
3. 5 VDC USB VBUS power from PC via the CP2103 USB connector (P2, labeled “COMM”)
All the three power sources are ORed together using reverse-biased diodes (D1, D2, D3), eliminating the need for
headers to choose between the sources. The target board will operate as long as any one of the power sources is
present. The ORed power is regulated to a 3.3 V dc voltage using a LDO regulator (U2). The output of the regulator
powers the +3 VD net on the target board, and is also connected to one end of the header J2. A shorting block
should be installed on J2 to power the VDD net, which powers the C8051F800 MCU. With the shorting block
removed, a multimeter can be used across J2 to measure the current consumption of the MCU.
7.3. System Clock Sources (J8, J9)
7.3.1. Internal Oscillators
The C8051F800 device installed on the target board features a factory-calibrated, programmable high-frequency
internal oscillator (24 MHz base frequency, ±2%), which is enabled as the system clock source on reset. After
reset, the internal oscillator operates at a frequency of 3.0625 MHz by default but may be configured by software to
operate at other frequencies. The on-chip crystal is accurate for many serial communications (UART, SPI, SMBus)
and an external oscillator is not required depending on the bit rate. However, if you wish to operate the C8051F800
device at a frequency not available with the internal oscillator, an external crystal may be used. Refer to the
C8051F80x-83x data sheet for more information on configuring the system clock source.
7.3.2. External Oscillator Options
The target board is designed to facilitate the installation of an external crystal. Remove shorting blocks at headers
J8 and J9 and install the crystal at the pads marked Y1. Install a 10 M resistor at R9 and install capacitors at C13
and C14 using values appropriate for the crystal you select. If you wish to operate the external oscillator in
capacitor or RC mode, options to install a capacitor or an RC network are also available on the target board.
Populate C13 for capacitor mode, and populate R7 and C13 for RC mode. Refer to the C8051F80x-83x data sheet
for more information on the use of external oscillators.
Rev. 0.2
9
C8051F800-DK
7.4. Switches and LEDs (J3)
Two push-button switches are provided on the target board. The switch labeled ‘RESET’ (SW1 in schematic) is
connected to the reset pin (RST) of the C8051F800. Pressing this switch puts the device into its hardware-reset
state. The switch labeled “P1.4” (SW2 in schematic) is connected to the C8051F800’s general purpose I/O (GPIO)
pin through headers. Pressing this switch generates a logic low signal on the port pin. Remove the shorting block
from the header to disconnect this switch from the port pin. The port pin signal is also routed to a pin on the J1 I/O
connector. See Table 1 for the port pins and headers corresponding to each switch.
Two capacitive sense switches are also provided on the target board. The operation of these switches needs
appropriate code running on the C8051F800 MCU that can sense the state of the switch. Note that no shorting
blocks should be present on J3[15-16] and J3[17-18] for proper operation of these switches. See Section 6.3.
"Capacitive Sense Switch Example‚" on page 6 for details about example source code.
Six LEDs are provided on the target board to serve as indicators. The red LED labeled “PWR” is used to indicate
the presence of power to the target board. Another red LED labeled “USB” is used to indicate a valid USB
connection via the USB connector labeled “COMM.” Note that this LED will light up only after CP210x device
drivers are loaded successfully on the PC. The four green LEDs labeled with port pin names P1.0_LED through
P1.3_LED are connected to the C8051F800’s GPIO pins P1.0 through P1.3, respectively, via the header J3.
Remove the shorting block from the header to disconnect the LED from the port pin. The port pin signal is also
routed to a pin on the J1 I/O connector. See Table 1 for the port pins and headers corresponding to each LED.
Table 1. Target Board I/O Descriptions
Description
I/O
Header(s)
RESET (SW1)
Reset
none
P1.4 (SW2)
P1.4
J3[9-10]
P1.5 (Capacitive Sense)
P1.5
J3[15-16]*
P1.6 (Capacitive Sense)
P1.6
J3[17-18]*
P1.0_LED (Green LED)
P1.0
J3[1-2]
P1.1_LED (Green LED)
P1.1
J3[3-4]
P1.2_LED (Green LED)
P1.2
J3[5-6]
P1.3_LED (Green LED)
P1.3
J3[7-8]
PWR (Red LED)
Power
none
USB (Red LED)
USB Active
none
*Note: Shorting blocks should NOT be present at these headers for
the proper operation of the capacitive sense switches.
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Rev. 0.2
C8051F800-DK
7.5. Target Board Debug Interface (J4)
The DEBUG connector J4 provides access to the DEBUG (C2) pins of the C8051F800. It is used to connect the
Serial Adapter or the USB Debug Adapter to the target board for in-circuit debugging and Flash programming.
Table 2 shows the DEBUG pin definitions.
Table 2. DEBUG Connector Pin Descriptions
Pin #
Description
1
+3 VD (+3.3 VDC)
2, 3, 9
GND (Ground)
4
P2.0/C2D
5
RST (Reset)
6
P2.0
7
RST/C2CK
8
Not Connected
10
USB Power (+5 VDC)
7.6. Serial Interface (P2, J3)
A USB-to-UART bridge circuit (U3) and USB connector (P2) are provided on the target board to facilitate serial
connections to UART0 of the C8051F800. The Silicon Labs CP2103 USB-to-UART bridge provides data
connectivity between the C8051F800 and the PC via a USB port. The TX, RX, RTS and CTS signals of UART0
may be connected to the CP2103 by installing shorting blocks on header J3. Note that the use of the optional RTS/
CTS handshaking signals will prevent the simultaneous use of the capacitive sense switches because those GPIO
pins are shared on this board. The shorting block positions for connecting each of these signals to the CP2103 are
listed in Table 3. To use this interface, the USB-to-UART device drivers should be installed as described in Section
4.3. "CP210x USB to UART VCP Driver Installation‚" on page 3.
Table 3. Serial Interface Header Description
Header Pins UART0 Pin Description
J3[11–12]
J3[13–14]
J3[15–16]
J3[17–18]
TX_MCU (P0.4)
RX_MCU (P0.5)
RTS (P1.5)
CTS (P1.6)
7.7. Potentiometer (J6, J7)
The C8051F800 MCU has the option to connect port pin P0.7 to a 10K linear potentiometer (R14). The
potentiometer is connected through the J6 and J7 headers. The potentiometer can be used for testing the analogto-digital (ADC) converter of the MCU.
Rev. 0.2
11
C8051F800-DK
7.8. Analog I/O, Voltage and Ground Reference Options (TB1, J5, J10)
Several of the C8051F800 target device’s port pins are connected to the TB1 terminal block. Refer to Table 4 for
the TB1 terminal block connections. The J5 header connects the MCU VREF pin (P0.0) to the VREF bypass
capacitors C18 and C19, and also to TB1 pin 6 for an optional external VREF input. The J10 header connects P0.1
to GND, and is useful if the P0.1/AGND option is enabled via the REF0CN register in the C8051F800. Refer to the
C8051F80x-83x data sheet for more information on configuring the voltage and ground reference options.
Table 4. TB1 Terminal Block Pin Descriptions
Pin #
Description
1
2
3
4
5
6
P0.6/CNVSTR
P1.0
P1.1
P0.1/AGND
GND (Ground)
P0.0/VREF (Voltage Reference)
7.9. C2 Pin Sharing
On the C8051F800, the debug pins C2CK and C2D are shared with the pins RST and P2.0 respectively. The target
board includes the resistors necessary to enable pin sharing which allow the RST and P2.0 pins to be used
normally while simultaneously debugging the device. See Application Note “AN124: Pin Sharing Techniques for the
C2 Interface” at www.silabs.com for more information regarding pin sharing.
12
Rev. 0.2
C8051F800-DK
7.10. Target Board Pin Assignment Summary
Some GPIO pins of the C8051F800 MCU can have an alternate fixed function. For example, pin 17on the
C8051F800-GM MCU is designated P0.4, and can be used as a GPIO pin. Also, if the UART0 peripheral on the
MCU is enabled using the crossbar registers, the TX signal is routed to this pin. This is shown in the "Alternate
Fixed Function" column. The "Target Board Function" column shows that this pin is used as TX on the C8051F800
Target Board. The "Relevant Headers" column shows that this signal is routed to pin 15 of the J1 header and pin 12
of the J3 header. More details can be found in the C8051F80x-83x data sheet. Some of the GPIO pins of the
C8051F800 have been used for various functions on the target board. Table 5 summarizes the MCU pin
assignments on the target board, and also shows the various headers associated with each signal.
Table 5. C8051F800 Target Board Pin Assignments and Headers
MCU Pin Name
Pin#
(‘F800-GM)
Primary
Function
Alternate Fixed
Function
Target Board
Function
Relevant Headers
P0.0
1
P0.0 (GPIO)
VREF
VREF
J1[19], TB1[6]*, J5[1]
P0.1
20
P0.1 (GPIO)
AGND
GPIO/AGND
J1[20], TB1[4], J10[1]
P0.2
19
P0.2 (GPIO)
XTAL1
XTAL1
J1[17]*, J8[2]
P0.3
18
P0.3 (GPIO)
XTAL2
XTAL2
J1[18]*, J9[2]
P0.4
17
P0.4 (GPIO)
TX_MCU
TX_MCU
J1[15], J3[12]
P0.5
16
P0.5 (GPIO)
RX_MCU
RX_MCU
J1[16], J3[14]
P0.6
15
P0.6 (GPIO)
CNVSTR
CNVSTR
J1[13], TB1[1]
P0.7
14
P0.7 (GPIO)
Potentiometer
J1[14], J6[1]
P1.0
13
P1.0 (GPIO)
LED
J1[11], J3[2], TB1[2]
P1.1
12
P1.1 (GPIO)
LED
J1[12], J3[4], TB1[3]
P1.2
11
P1.2 (GPIO)
LED
J1[9], J3[6]
P1.3
10
P1.3 (GPIO)
LED
J1[10], J3[8]
P1.4
9
P1.4 (GPIO)
Switch (SW2)
J1[7], J3[10]
P1.5
8
P1.5 (GPIO)
Capacitive Sense
Switch / RTS
J1[8], J3[16]
P1.6
7
P1.6 (GPIO)
Capacitive Sense
Switch / CTS
J1[5], J3[18]
P1.7
6
P1.7 (GPIO)
GPIO
J1[6]
P2.0/C2D
5
P2.0 (GPIO)
C2D
P2.0/C2D
J1[3]*, J4[6]*, J4[4]
RST/C2CK
4
RST (Reset)
C2CK
RST/C2CK
J1[4]*, J4[5]*, J4[7]
VDD
3
VDD (Power)
VDD
J2[2]
GND
2
GND (Ground)
GND
J1[1], J1[2], TB1[5]
*Note: Headers denoted by this symbol are not directly connected to the MCU pin; the connection might be via one or more
headers and/or pin-sharing resistor(s). See board schematic for details.
Rev. 0.2
13
Figure 5. C8051F800 Target Board Schematic (Page 1 of 2)
C8051F800-DK
8. Schematics
14
Rev. 0.2
Figure 6. C8051F800 Target Board Schematic (Page 2 of 2)
C8051F800-DK
Rev. 0.2
15
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