Teensy 4.0
DEV-15583
Teensy 4.0 is the latest Teensy, offering the fastest microcontroller and powerful peripherals in the
Teensy 1.4 by 0.7 inch form factor. It features an ARM Cortex-M7 processor at 600MHz, with a NXP
iMXRT1062 chip, the fastest microcontroller available today. Teensy 4.0 is the same size and shape
as Teensy 3.2, and retains compatibility with most of the pin functions on Teensy 3.2.
When running at 600 MHz, Teensy 4.0 consumes approximately 100mA current. Teensy 4.0
provides support for dynamic clock scaling. Unlike traditional microcontrollers, where changing the
clock speed causes wrong baud rates and other issues, Teensy 4.0 hardware and Teensyduino's
software support for Arduino timing functions are designed to allow dynamically speed changes.
Serial baud rates, audio streaming sample rates, and Arduino functions like delay() and millis(), and
Teensyduino's extensions like IntervalTimer and elapsedMillis, continue to work properly while the
CPU changes speed. Teensy 4.0 also provides a power shut off feature. By connecting a pushbutton
to the On/Off pin, the 3.3V power supply can be completely disabled by holding the button for 5
seconds, and turned back on by a brief button press. If a coin cell is connected to VBAT, Teensy
4.0's RTC also continues to keep track of date & time while the power is off. Teensy 4.0 also can
also be overclocked, well beyond 600MHz!
The ARM Cortex-M7 brings many powerful CPU features to a true real-time microcontroller platform.
Cortex-M7 is a dual-issue superscaler processor, meaning the M7 can execute two instructions per
clock cycle, at 600MHz! Of course, executing two simultaneously depends upon the compiler
ordering instructions and registers. Initial benchmarks have shown C++ code compiled by Arduino
tends to achieve two instructions about 40% to 50% of the time while performing numerically
intensive work using integers and pointers. Cortex-M7 is the first ARM microcontroller to use branch
prediction. On M4, loops and other code which much branch take three clock cycles. With M7, after
a loop has executed a few times, the branch prediction removes that overhead, allowing the branch
instruction to run in only a single clock cycle.
Tightly Coupled Memory is a special feature which allows Cortex-M7 fast single cycle access to
memory using a pair of 64 bit wide buses. The ITCM bus provides a 64 bit path to fetch instructions.
The DTCM bus is actually a pair of 32 bit paths, allowing M7 to perform up to two separate memory
accesses in the same cycle. These extremely high speed buses are separate from M7's main AXI
bus, which accesses other memory and peripherals. 512K of memory can be accessed as tightly
coupled memory. Teensyduino automatically allocates your Arduino sketch code into ITCM and all
non-malloc memory use to the fast DTCM, unless you add extra keywords to override the optimized
default. Memory not accessed on the tightly coupled buses is optimized for DMA access by
peripherals. Because the bulk of M7's memory access is done on the two tightly coupled buses,
powerful DMA-based peripherals have excellent access to the non-TCM memory for highly efficient
I/O.
Teensy 4.0's Cortex-M7 processor includes a floating point unit (FPU) which supports both 64 bit
"double" and 32 bit "float". With M4's FPU on Teensy 3.5 & 3.6, and also Atmel SAMD51 chips, only
32 bit float is hardware accelerated. Any use of double, double functions like log(), sin(), cos() means
slow software implemented math. Teensy 4.0 executes all of these with FPU hardware.
Note: Please be aware that the Teensy 4.0 does not include headers and will need to be purchased
separately and soldered on yourself.
FEATURES
ARM Cortex-M7 at 600MHz
1024K RAM (512K is tightly coupled)
2048K Flash (64K reserved for recovery & EEPROM emulation)
2 USB ports, both 480MBit/sec
3 CAN Bus (1 with CAN FD)
2 I2S Digital Audio
1 S/PDIF Digital Audio
1 SDIO (4 bit) native SD
3 SPI, all with 16 word FIFO
3 I2C, all with 4 byte FIFO
7 Serial, all with 4 byte FIFO
32 general purpose DMA channels
31 PWM pins
40 digital pins, all interrrupt capable
14 analog pins, 2 ADCs on chip
Cryptographic Acceleration
Random Number Generator
RTC for date/time
Programmable FlexIO
Pixel Processing Pipeline
Peripheral cross triggering
Power On/Off management
https://www.sparkfun.com/products/15583/8‐13‐19
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