SC802A

SC802A VER2.1 SPECIFICATION OF SC802A Akihabara Inc. www.akiba-tech.com Akihabara Inc. www.akiba-tech.com Page 1 of 1 SC802A CONTENT VER2.1 1. General description --------------------------------------------------------------------------3 2. Maximum absolute limit---------------------------------------------------------------------3 3. Mechanical characteristics------------------------------------------------------------------3 a) Physical data b) External dimensions 4. Electrical characteristics---------------------------------------------------------------------4 a) DC characteristics b) AC characteristics 5. Operating Principles--------------------------------------------------------------------------6 a) Pin description b) Block diagram c) Instruction description 6. Operating Methods---------------------------------------------------------------------------13 a) Interface with MPU b) Power supply c) Operating example Akihabara Inc. www.akiba-tech.com Page 2 of 2 SC802A 1. General description VER2.1 SC161A, a dot-matrix character LCD module, design for displaying 1 line 16 row characters. Character font is 5X7 dots with cursor. The SC161A provides two types of interfaces to MPU: 4-bit and 8-bit interfaces. SC161A can includes EL or LED backlight for custom design. The custom can design for color of EL or LED backlight, viewing angle and LCD type. 2. Maximum absolute limit Symbol Ratings Remark VDD -0.3V to +7.0V VLCD VDD - 12V to VDD + 0.3V VIN -0.3V to VDD + 0.3V TA1 -10°C to+60°C Normal temperature LCM Operating Temperature -20°C to+60°C Ta2 Wide temperature LCM Storage Temperature TSTO -25°C to+70°C Note: Stresses beyond those given in the Absolute Maximum Rating table may cause operational errors or damage to the device. Characteristics Operating Voltage Driver Supply Voltage Input Voltage Range 3. Mechanical characteristics a) Physical data ITEM Number of characters Module size Viewing area Active area Character size Character pith Approx. weight Drive method b) External dimensions Standard value 8×2 40.0×35.50×7.5 30.40×14.20 25.74×9.48 2.78×4.49 3.75 1/16 duty 1/5bias Unit mm mm mm mm mm g Remark 40 37.7 36 0.5 3.4 0.57 0.5 10.38 2.54 2 PITCH2.54x7=17.78 R0.5x16 16 15 R0.9x16 2 1 0.5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SCALE:2:1 DATE REV. 30.4(V.A) R1.25x4 35.8 R2.0x4 VSS VDD V0 RS R/W E DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 0.5 0.57 14.2(V.A) 7.3 3.2 3.5 1.6 23.3 30 UNIT:mm DigiT r on DRAWN: CHECKED: CONFIRMED: SC802A 05/08/2003 1.0 Akihabara Inc. www.akiba-tech.com Page 3 of 3 SC802A 4. Electrical characteristics a) DC characteristics a.1) DC CHARACTERISTICS (TA =25 °C, VDD = 2.7 to 4.5V) Characteristics Symbol Limit Min. Input High Voltage Input Low Voltage Input High Current Input Low Current Output High Voltage Output Low Voltage LCD Voltage Operating Current VIm VlL IIh IlL Voh VOL Vlcd Idd 0.7VDD -0.3 -1.0 -5.0 -15 Typ. Max. VDD 0.55 1.0 -30 13 V V uA uA V V mA IOH = VER2.1 Unit Test Condition VDD = 3.0V 0.75VDD 3 4.5v 1.0 - 0.1mA Pins: DB7-0 0.2VDD v |OL= 0.1mA Pins: DB7-0 Note: VDD = 3V a.2) DC CHARACTERISTICS (TA = 25°C, VDD = 4.5 to 5.5V) Characteristics Symbol Limit Min. Input High Voltage Input Low Voltage Input High Current Input Low Current Output High Voltage Output Low Voltage LCD Voltage Operating Current VIm VlL IIh IlL Voh VOL Vlcd Idd 2.2 -0.3 -2.0 -20 2.4 3 -50 4.5 1.0 Typ. Max. VDD 0.6 2.0 -100 VDD 0.4 13 Unit V V uA uA V V V mA Test Condition VDD = 5.0V IOH = - 0.1mA Pins: DB7-0 IOL= 0.1mA Pins: DB7-0 Note: VDD = 5V b) AC characteristics b.1) AC CHARACTERISTICS (TA = 25°C, VDD = 2.7 to 4.5V) Write Mode (Writing data from MPU to LCD module) Characteristics Symbol Limit Min. E Cycle Time E Pulse Width E Rise/Fall Time Address Setup Time Address Hold Time Data Setup Time Data Hold Time tc tpw tR,tF tsp-i tHD1 tsP2 tHD2 1000 450 60 20 195 10 25 Typ. Max. Unit ns ns ns ns ns ns ns Test Condition PinE PinE PinE Pins: RS, R/W, E Pins: RS, R/W, E Pins: DB7-0 Pins: DB7-0 Akihabara Inc. www.akiba-tech.com Page 4 of 4 SC802A Read Mode (Reading data from LCD module to MPU) Limit Characteristics Symbol Max. Min. Typ. E Cycle Time tc 1000 E Pulse Width tw 450 E Rise/Fall Time tR,tF 25 Address Setup Time tsp-i 60 Address Hold Time tHD1 20 Data Output Delay Time tD 360 Data hold time tHD2 5.0 b.2) AC CHARACTERISTICS (ta = 25°C, VDD = 4.5 to 5.5V) Write Mode (Writing Data from MPU to LCD module) Limit Characteristics Symbol Min. Typ. Max. E Cycle Time tc 400 150 E Pulse Width tpw 25 E Rise/Fall Time tR,tF 30 Address Setup Time tsp-i tHD1 10 Address Hold Time tsP2 40 Data Setup Time 10 Data Hold Time tHD2 Read Mode (Reading Data from LCD module to MPU) Limit Characteristics Symbol Typ. Min. E Cycle Time tc 400 E Pulse Width tw 150 E Rise/Fall Time tR,tF tsp-i 30 Address Setup Time Address Hold Time tHD1 10 Data Output Delay Time tD Data hold time tHD2 20 Unit ns ns ns ns ns ns ns VER2.1 Test Condition PinE PinE PinE Pins: RS, R/W,E Pins: RS, R/W,E Pins: DB7-0 Pin DB7- 0 Unit ns ns ns ns ns ns ns Unit Test Condition PinE PinE PinE Pins: RS, R/W, E Pins: RS, R/W, E Pins: DB7-0 Pins: DB7-0 Test Condition Pin E Pin E Pin E Pins: RS, R/W,E Pins: RS, R/W,E Pins: DB7-0 Pin DB7-0 Max. ns ns ns ns ns ns ns 25 100 - Akihabara Inc. www.akiba-tech.com Page 5 of 5 SC802A TIMING CHARACTERISICS RS th 1 ts u 1 R /W tw tf th 1 VER2.1 E tr ts u 2 th 2 D B 0~D B 7 V a lid D a ta tc Write Timing RS ts u th R /W tw tf E tr td D B 0~D B 7 V a lid D a ta tc td h th Read Timing 5. Operating Principles a) Pin description Pin NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol VSS VDD V0 RS R/W E DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 Level 0V 2.7V~5.5V H/L H/L H→L H/L H/L H/L H/L H/L H/L H/L H/L Function Ground Supply voltage for logic Variable voltage for LCD H: Instruction code L: Data H: Read signal L: Write signal enable signal Data bits In case of 4 bits instruction, data is transferred by twice using only 4 buses of D4 – D7 ,and D0 – D3 are not used , first operation is higher order 4 bits and second is lower 4 bits of 8 bits , but in case of 8 bits instruction , data is transferred by data by data bus of D0 – D7 Akihabara Inc. www.akiba-tech.com Page 6 of 6 SC802A b) Block Diagram AC IR RS R/W E D0-D3 D4-D7 I/O B U F F E R D E C O D E R VER2.1 Timing Control Circuit DD RAM Cursor and blink CKT. COM Driving Circuit LCD DR CG RAM CG RAM Driving Circuit VDD VO VSS BUSY FLAG P TO S registor a. Data Register (DR): Dris a register used for temporary Storage of the data read/write form/into DD RAM and CG RAM. b. Instruction Register (IR): is a register available for storing the instruction codes and address information of display data (DD) RAM and character generator (CG) RAM. c. BUSY FLAG (BF): When the Busy Flag is “1”,it shows that LCM is in internal operation and it can not accept the next instruction. d. Character Generator (CG) ROM: This ROM Generates character pattern from 8-bit character code and provides 192 character patterns. e. Character Generator (CG)RAM: This RAM allows the user to rewrite the character patterns freely according to the program. f. Address Counter (AC): This address counter is used to give the address information of DD RAM and CG RAM. g. Display Data (DD) RAM: This display data RAM is used to store the display data expressed by 8-bit character code . The capacity is 80x 8bits and data for 80 characters can be storage. h. Cursor and Blink Control Circuit: This circuit generates the cursor and blink. Akihabara Inc. www.akiba-tech.com Page 7 of 7 SC802A RAM's address and the LCD's position shown bellows. Display Character address code: Display position 1 2 3 4 5 6 DDRAM Address 00 40 01 41 02 42 03 43 04 44 05 45 7 06 46 8 07 47 VER2.1 Relationship between Character Code (DDRAM) and character Pattern (CGRAM) Character code DD RAM Data B7 B6 B5 B4 B3 B2 B1 B0 B5 CG RAM Address B4 B3 B2 B1 B0 B7 Character Pattern CG RAM Data B6 B5 B4 B3 B2 B1 B0 0 0 0 0 0 0 0 0 x 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 x 0 0 1 0 0 1 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 x 0 1 0 1 0 1 0 1 x 0 1 0 1 x x x x 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1. ▆ It means that the bit0~2 of the character code correspond to the bit3~5 of the CG RAM address. 2. ▆ these areas are not used for display, but can be used for the general data RAM. 3. When all of the bit4-7 of the character code is 0, CG RAM character patterns are selected. 4. " 1 ": Selected," 0 ": No selected," X": Do not care (0 or 1). 5. for example (1), to set character code (b2 = b1 = b0 = 0, b3 = 0 or 1, b7-b4 = 0) is to display" T". That means character code (00)16, and (08)16 can display" T” character. 6. The bits 0-2 of the character code RAM is character pattern line position. The 8th line is the cursor position and display is formed by logical OR with the cursor Akihabara Inc. www.akiba-tech.com Page 8 of 8 SC802A CGROM Character Code Table: Upper 4bit Lower 4bit VER2.1 LLLL LLLH LLHL LLHH LHLL LHLH LHHL LHHH HLLL HLLH HLHL HLHH HHLL HHLH HHHL HHHH CG RAM (1) (2) L LLL LLLH LLHL (3) LLHH (4) LHLL (5) LHLH (6) LHHL (7) LHHH (8) HLLL (1) HLLH (2) HLHL (3) HLHH (4) HHLL (5) HHLH (6) HHHL (7) HHHH (8) Akihabara Inc. www.akiba-tech.com Page 9 of 9 SC802A c) Instruction description VER2.1 Control and display instructions will show in details as following: c.1) Clear Display RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 0 0 0 0 1 It clears the whole display and sets display data RAM's address 0 in address counter. c.2) Return Home RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 0 0 0 1 X X: Do not care (0 or 1) It sets display data RAM's address 0 in address counter and display returns to its original position. The cursor or blink goes to the display (to the 1st line if 2 lines are displayed). The contents of the Display Data RAM do not change. c.3) Entry Mode Set During writing and reading data, it sets cursor move direction and shifts the display. RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 0 0 1 I/D S I/ D = 1: Increment, I / D = 0: Decrement. S = 1: The display shift, S = 0: The display does not shift S= 1 I/D= 1 It shifts the display to the left S= 1 I/D=0 It shifts the display to the right R/W 0 D7 D6 D5 0 0 0 D4 D3 D2 0 1 D D1 D0 C B c.4) Display On/Off Control RS 0 D = 1: Display on, D = 0: Display off C = 1: Cursor on , C = 0: Cursor off B = 1: Blinks on, B= 0: Blinks off c.5) Cursor or Display Shift Without changing DD RAM's daters, it can move cursor and shift display RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 1 S/C R/L X X S/C R/L Description Address Counter 0 0 Shift cursor to the left AC = AC - 1 0 1 Shift cursor to the right AC = AC + 1 1 0 Shift display to the left. Cursor follows the display shift AC=AC 1 1 Shift display to the right. Cursor follows the display shift AC=AC c.6) Function Set RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 1 DL N F X X X: Do not care (0 or 1) DL: It sets interface data length. DL = 1: Datas are transferred with 8-bit lengths (DB7 - 0).DL = 0: Datas are transferred with 4-bit lengths (DB7 - 4). (It needs two times to transfer datas) N: It sets the number of the display line. N = 0: One-line display. N = 1: Two-line display. F: F = 1: 5 x 10 dots character font. N F No. of Display Lines Character Font Duty Factor 0 0 1 0 1 X 1 1 2 5X7 dots 5x 10 dots 5x7 dots 1 /8 1 /11 1 /16 Akihabara Inc. www.akiba-tech.com Page 10 of 10 SC802A VER2.1 c.7) Set Character Generator RAM Address RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 1 a a a a a a It sets character generator RAM address (aaaaaa)2 to the address counter. Character generator RAM data can read or write after this setting. c.8) Set Display Data RAM Address RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 1 a a a a a a a It sets display data RAM address (aaaaaaa)2 to the address counter. Display data RAM can read or write after this setting. In one-line display (N = 0), (aaaaaaa)2; (OO)16 - (4F)16 In two-line display (N = 1), (aaaaaaa)2: (00)16 - (27)16,gfor the first line, (aaaaaaa)2: (40)16 - (67)16,gfor the second line. c.9) Read Busy Flag and Address RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 1 BF a a a a a a a When (BF = 1) indicates that the system is busy now, it will not accept any instruction until no busy (BF = 0). At the same time, the address counter content’s (aaaaaaa)2; is read out. c.10) Write Data to Character Generator RAM or Display Data RAM RS R/W D7 D6 D5 D4 D3 D2 D1 D0 1 0 d d d d d d d d It writes data (dddddddd)2 to character generator RAM or display data RAM. c.11) Read Data from Character Generator RAM or Display Data RAM RS R/W D7 D6 D5 D4 D3 D2 D1 D0 1 1 d d d d d d d d It reads data (dddddddd)2 from character generator RAM or display data RAM. To get the correct data readout is shown below: (ⅰ)Set the address of the character generator RAM or display data RAM or shift the cursor instruction. (ii) Send the “Read “instruction. Akihabara Inc. www.akiba-tech.com Page 11 of 11 SC802A Instruction table Instruction Code Instruction RS RW D7 D6 D5 Clear Display Return Home 0 0 0 0 0 D4 0 D3 0 D2 0 D1 0 D0 1 Description VER2.1 Execution time (fosc=270KHz) 0 0 0 0 0 0 0 0 1 - Write "20H" to DDRAM and 1.52ms set DDRAM address to "OOH" from AC Set DDRAM address to 1.52ms "OOH" from AC and return cursor to its original position if shifted. The contents of DDRAM are not changed. Assign cursor moving direction and enable the shift of entire display Set display(D), cursor(C), and blinking of cursor(B) on/off control bit. Set cursor moving and display shift control bit, and the direction, without changing of DDRAM data. Set interface data length (DL: 8-bit/4-bit), numbers of display line (N: 2-line/1line) and, display font type (F:5x10dots/5x8dots) 38us Entry 0 Mode Set Display 0 ON/ OFF Cursor or 0 Display Shift Function Set 0 0 0 0 0 0 0 1 I/D S 0 0 0 0 0 1 D C B 38us 0 0 0 0 1 S/C R/L - - 38us 0 0 0 1 DL N F - - 38us Set CGRAM Address Set DDRAM Address Read Busy Flag and Address Counter 0 0 0 1 AC5 AC4 AC3 AC2 AC1 ACO Set CGRAM address in address counter. 38us 0 0 1 AC6 AC5 AC4 AC3 AC2 AC1 ACO Set DDRAM address in counter 38us 0 1 BF AC6 AC5 AC4 AC3 AC2 AC1 ACO W hether during internal operation or not can be known by reading BF. The contents of address counter can also be read. D7 D6 D5 D4 D3 D2 D1 DO Write data into internal RAM (DDRAM/CGRAM). Read data from internal RAM (DDRAM/CGRAM). 38us Write Data 1 to RAM Read Data 1 from RAM 0 38us 1 D7 D6 D5 D4 D3 D2 D1 DO 38us Akihabara Inc. www.akiba-tech.com Page 12 of 12 SC802A 6. Operating Methods a) Interface with MPU VER2.1 A0 A 1 -A 7 7 RS MUX C D Q R E Z80 In te rfa c e to Z 8 0 C P U /W R /R D /IR Q LCM RW D 0 -D 7 D 0 -D 7 8 E E I n te r f a c e to M C 6 8 0 0 C P U A0 RS M C 6800 /R D LCM RW 8 D 0 -D 7 D 0 -D 7 A 14 RS A 15 I n te r f a c e to M C S 5 1 C P U /R D /W R E LCM RW 8 D 0 -D 7 M C S51 D 0 -D 7 Akihabara Inc. www.akiba-tech.com Page 13 of 13 SC802A b) Power supply VER2.1 Single Supply Voltage Types 5V VDD Dual Supply Voltage Types +3V VDD VDD VDD-VO VDD VO 10k~20k VDD-V0 LCM LCM VO 10k~20k VEE VSS GND VSS VDD-VO:LCD driving voltage VDD-VO:LCD driving voltage c) Operating example 8-Bit operation and 8-digit 1-line display (using internal reset) No Instruction Display 1 Power on . ( SPLC780A1 starts initializing ) 2 Function set RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 3 0 0 0 0 0 0 0 1 0 1 0 0 1 0 1 X 1 X 0 _ Display on / off control Operation Power on reset. No display. Set to 8-bit operation and select 1-line display line and character font. Display on. Cursor appears. 4 0 5 1 6 1 7 8 1 9 0 0 0 0 0 Entry mode set 0 0 0 0 1 1 0 _ Write data to CG RAM / DD RAM 0 0 1 0 1 0 1 1 1 W_ Increase address by one. It will shift the cursor to the right when writing to the DD RAM / CG RAM. Now the display has no shift. Write “W". The cursor is incremented by one and shifted to the right. Write “E ". The cursor is incremented by one and shifted to the right. Write data to CG RAM / DD RAM W E_ 1 0 0 ••• Write data to CG RAM / DD RAM 0 0 0 1 0 0 0 1 0 1 1 1 W ELCOME_ 0 1 0 1 •••• W ELCOME_ Entry mode set 000001 Write “E ". The cursor is incremented by one and shifted to the right. Set mode for display shift when writing Write" "(space). The cursor is incremented by one and shifted to the right. 10 1 Write data to CG RAM / DD RAM 0 0 0 1 0 0 0 0 0 ELCOME_ Akihabara Inc. www.akiba-tech.com Page 14 of 14 SC802A 11 1 12 13 1 14 15 16 17 18 19 20 21 0 0 0 0 0 0 0 1 0 0 1 Write data to CG RAM / DD RAM 0 0 1 0 0 ••••• Write data to CG RAM / DD RAM 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 0 0 0 0 0 1 1 1 0 1 1 0 ••••• return home 0 0 0 1 0 1 0 0 1 1 0 0 0 0 0 1 1 1 0 0 X X 1 X X 0 1 COMPAMY X COMPAMY X OMPANY 0 COMPANY X COMPANY X OMPANY 0 •• W ELCOME 0 0 1 1 •• COMPAMY LCOME C VER2.1 Write “C ". The cursor incremented by one and shifted the right. Write " Y " . The cursor is incremented by one and shifted to the right. Only shift the cursor's position to the left (Y). Only shift the cursor's position to the left (M). Write “N ". The display moves to the left. Shift the display and the cursor's position to the right. Shift the display and the cursor's position to the right. Write " " (space). The cursor is incremented by one and shifted to the right Both the display and the cursor return to the original position (address 0). Cursor Or Display Shift cursor or display shift Write data to CG RAM / DD RAM cursor or display shift cursor or display shift Write data to CG RAM / DD RAM 4-Bit operation and 8-digit 1-line display (using internal reset) No Instruction Display 1 Power on . ( SPLC780A1 starts initializing ) Function set RS R/W D7 D6 D5 D4 2 0 0 0 0 1 0 Function set 3 0 0 4 0 0 0 0 0 1 0 0 0 1 0 0 0 1 1 X 0 0 0 X _ 0 0 _ 0 0 0 1 0 0 W_ 1 1 Operation Power on reset. No display. Set to 4-bit operation Set to 4-bit operation and select 1-line display line and character font. Display on / off control Display on. Cursor appears. Entry mode set 5 0 0 6 1 1 0 0 0 0 0 1 0 0 0 1 1 1 Increase address by one. It will shift the cursor to the right when writing to the DD RAM / CG RAM. Now the display has no shift. Write “W “. The cursor is incremented by one and shifted to the right. Write data to CG RAM / DD RAM Akihabara Inc. www.akiba-tech.com Page 15 of 15 SC802A Reset function At power on, it starts the internal auto-reset circuit and executes the initial instructions . There are the initial procedures shown as bellows: VER2.1 Power on 8bits interface Waite time > 15ms after VDD>4.5V RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0011XXXX BF cannot be checked before this instruction Function set (interface is 8 bits length). Wait time > 4.1ms RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0011XXXX BF cannot be checked before this instruction Function set (interface is 8 bits length). Wait time > 100us RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0011XXXX BF cannot be checked before this instruction Function set (interface is 8 bits length). RS R/W D7 D6 D5 D4 D3 D2 D1 D0 0 0 0011NFXX 0 0 00001000 0 0 00000001 0 0 0 0 0 0 0 1 I/D S Initialization end BF cannot be checked after the following Instructions Function set (interface is 8 bits length. specify The number of display lines and character Font .) The number of display lines and character cannot be changed afterwards. Display off Display clear Entry mode set Akihabara Inc. www.akiba-tech.com Page 16 of 16 SC802A Power on VER2.1 4bits interface Waite time > 15ms after VDD>4.5V RS 0 R/W D7 D6 D5 D4 0 0 0 11 BF cannot be checked before this instruction Function set (interface is 8 bits length). Wait time > 4.1ms RS 0 R/W D7 D6 D5 D4 0 0 0 11 BF cannot be checked before this instruction Function set (interface is 8 bits length). Wait time > 100us RS 0 R/W D7 D6 D5 D4 0 0 0 11 BF cannot be checked before this instruction Function set (interface is 8 bits length). RS 0 0 0 0 0 0 0 0 0 R/W 0 0 0 0 0 0 0 0 0 D7 0 0 N 0 1 0 0 0 0 D6 0 0 F 0 0 0 0 0 1 D5 1 1 X 0 0 0 0 0 I/D D4 0 0 X 0 0 0 1 0 S BF cannot be checked after the following Instructions Function set (set interface to be 4 bits length) Interface 8 bits length Function set (interface is 8 bits length. specify The number of display lines and character Font.) The number of display lines and character cannot be changed afterwards. Display off Display clear Entry mode set Initialization end Akihabara Inc. www.akiba-tech.com Page 17 of 17