SC802B VER2.1 SPECIFICATION OF SC802B AKIHABARA INC. Page 1 of 1 SC802B VER2.1 CONTENT 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 c) EL backlight d) LED backlight 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. Page 2 of 2 SC802B VER2.1 1. General description SC802B, a dot-matrix character LCD module, design for displaying 2 line 8 row characters. Character font is 5X7 dots with cursor. The SC802B provides two types of interfaces to MPU: 4-bit SC802B 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 Characteristics Symbol Ratings Operating Voltage VDD -0.3V to +7.0V Driver Supply Voltage VLCD VDD - 12V to VDD + 0.3V Input Voltage Range VIN -0.3V to VDD + 0.3V TA1 -10°C to+60°C Normal temperature LCM Ta2 -20°C to+60°C Wide temperature LCM Operating Temperature Remark 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. 3. Mechanical characteristics a) Physical data ITEM Standard value Number of characters 8×2 Module size 58.0×32.0×13.6 mm Viewing area 38.00×16.00 mm Active area 26.93×6.41 mm Character size 5.62×2.99 mm Character pith 6.05×3.43 mm Unit Remark g Approx. weight Drive method b) External dimensions 1/5bias 1/16 duty 58.00±0.5 53.00±0.3 44.20±0.3 38.00±0.3 13.60 1.50 10.00 26.93 0.06 0.55 1.70 12 5.00 12.00 16.00±0.3 0.65 0.06 PITCH 2.54*5=12.70 0.43 1 27.00±0.3 32.00±0.5 0.43 12-R0.50 2 4-R1.25 1.60 2.54 UNIT: mm AKIHABARA INC. Page 3 of 3 SC802B VER2.1 4. Electrical characteristics a) DC characteristics a.1) DC CHARACTERISTICS (TA =25 °C, VDD = 2.7 to 4.5V) Limit Characteristics Symbol Unit Min. Typ. Max. - VDD V Input High Voltage VIm 0.7VDD Input Low Voltage VlL -0.3 0.55 V Input High Current IIh -1.0 1.0 uA Input Low Current IlL -5.0 -30 uA Output High Voltage Voh 0.75VDD - - V Output Low Voltage VOL - - 0.2VDD v LCD Voltage Vlcd 3 4.5v 13 Operating Current Idd -15 VDD = 3.0V IOH = - 0.1mA Pins: DB7-0 |OL= 0.1mA Pins: DB7-0 V 1.0 mA Note: VDD = 3V a.2) DC CHARACTERISTICS (TA = 25°C, VDD = 4.5 to 5.5V) Characteristics Symbol Limit Min. Test Condition Typ. Unit Test Condition Max. Input High Voltage VIm 2.2 VDD V Input Low Voltage VlL -0.3 0.6 V Input High Current IIh -2.0 2.0 uA Input Low Current IlL -20 -50 -100 uA Output High Voltage Voh 2.4 - VDD V IOH = - 0.1mA Pins: DB7-0 Output Low Voltage VOL - - 0.4 V IOL= 0.1mA Pins: DB7-0 LCD Voltage Vlcd 3 4.5 13 V Operating Current Idd 1.0 mA 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. VDD = 5.0V Typ. Unit Test Condition ns PinE Max. E Cycle Time tc 1000 E Pulse Width tpw 450 - - ns PinE E Rise/Fall Time tR,tF - - 25 ns PinE Address Setup Time tsp-i 60 ns Pins: RS, R/W, E Address Hold Time tHD1 20 ns Pins: RS, R/W, E Data Setup Time tsP2 195 ns Pins: DB7-0 Data Hold Time tHD2 10 ns Pins: DB7-0 AKIHABARA INC. - - Page 4 of 4 SC802B VER2.1 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 AKIHABARA INC. tHD2 20 - Unit Test Condition ns ns ns ns ns ns ns PinE PinE PinE Pins: RS, R/W,E Pins: RS, R/W,E Pins: DB7-0 Pin DB7- 0 Unit Test Condition ns ns ns ns ns ns PinE PinE PinE Pins: RS, R/W, E Pins: RS, R/W, E Pins: DB7-0 ns Pins: DB7-0 Unit Test Condition 100 ns ns ns ns ns ns Pin E Pin E Pin E Pins: RS, R/W,E Pins: RS, R/W,E Pins: DB7-0 - ns Pin DB7-0 - Max. 25 Page 5 of 5 SC802B VER2.1 TIMING CHARACTERISICS R S th 1 ts u 1 R /W th 1 tw tf E tr ts u 2 th 2 V a lid D a ta D B 0 ~ D B 7 tc Write Timing R S th ts u R /W th tw tf E tr td h td V a lid D a ta D B 0~D B 7 tc Read Timing 5. Operating Principles a) Pin description Pin NO. Symbol 1 DB6 2 DB7 3 DB4 4 DB5 5 R/W 6 E V0 7 RS 8 VSS 9 VDD 10 A 11 K 12 AKIHABARA INC. Level H/L H/L H/L H/L H/L H→L H/L H/L 0V 2.7V~5.5V 4.2V 0V Function Data bits H: Read signal L: Write signal enable signal Variable voltage for LCD H: Instruction code L: Data Ground Supply voltage for logic Supply voltage for LED-Backlight Supply voltage for LED-Backlight Page 6 of 6 SC802B VER2.1 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 DD RAM Cursor and blink CKT. VSS LCD COM Driving Circuit DR CG RAM CG RAM VDD VO Timing Control Circuit Driving Circuit 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. Page 7 of 7 SC802B RAM's address and the LCD's position shown bellows. Display Character address code: Display position 1 2 3 4 5 6 DDRAM Address VER2.1 7 8 9 10 11 12 13 14 15 16 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F Relationship between Character Code (DDRAM) and character Pattern (CGRAM) Character code DD RAM Data B7 0 0 B6 0 0 B5 0 0 B4 0 0 B3 x x B2 0 0 B1 0 0 CG RAM Address B0 0 1 B5 0 0 B4 0 0 B3 Character Pattern CG RAM Data B2 B1 B0 0 0 0 B4 B3 B2 B1 B0 0 1 1 1 1 1 0 1 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 1 0 0 1 0 0 0 B7 x B6 x B5 x 1 0 0 0 0 1 0 0 1 0 1 0 0 1 0 0 1 1 0 0 0 1 0 0 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 1 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 1 0 0 1 0 0 1 x x x 1 0 0 0 0 1 0 0 1 0 1 0 0 1 0 0 1 1 0 0 1 1 1 0 1 1 1 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. Page 8 of 8 SC802B VER2.1 CGROM Character Code Table: Upper 4bit Lower 4bit LLLL LLLH LLHL LLHH LHLL LHLH LHHL LHHH HLLL HLLH HLHL HLHH HHLL HHLH HHHL HHHH LLLL CG RAM (1) LLLH (2) 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. Page 9 of 9 SC802B VER2.1 c) Instruction description 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 left edge of 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 c.4) Display On/Off Control RS 0 R/W 0 D7 D6 D5 D4 D3 D2 0 0 0 0 1 D D1 D0 C B 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: It sets the character font. F = 0: 5 x 7 dots character font. F = 1: 5 x 10 dots character font. N F No. of Display Lines Character Font Duty Factor 0 0 1 5X7 dots 1 /8 0 1 1 5x 10 dots 1 /11 1 X 2 5x7 dots 1 /16 AKIHABARA INC. Page 10 of 10 SC802B 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. Page 11 of 11 SC802B Instruction table Instruction Code Instruction RS RW D7 D6 D5 VER2.1 Execution time (fosc=270KHz) D4 D3 D2 D1 D0 Description 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. Clear Display 0 0 0 0 0 0 0 0 0 1 Return Home 0 0 0 0 0 0 0 0 1 - Entry 0 Mode Set Display 0 ON/ OFF Cursor or 0 Display Shift 0 0 0 0 0 0 1 I/D S 0 0 0 0 0 1 D C B 0 0 0 0 1 S/C R/L - - DL N - - 38us 38us 38us 38us Function Set 0 0 0 0 1 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 Whether during internal operation or not can be known by reading BF. The contents of address counter can also be read. 38us Write Data 1 to RAM Read Data 1 from RAM 0 D7 D6 D5 D4 D3 D2 D1 DO Write data into internal RAM (DDRAM/CGRAM). 38us 1 D7 D6 D5 D4 D3 D2 D1 DO Read data from internal RAM (DDRAM/CGRAM). 38us AKIHABARA INC. F 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) Page 12 of 12 SC802B VER2.1 6. Operating Methods a) Interface with MPU RS A0 7 A 1 -A 7 MUX Z80 In te rfa c e to Z 8 0 C P U /W R /R D C Q D R E LCM /IR Q RW 8 D 0 -D 7 D 0 -D 7 E E I n te r f a c e to M C 6 8 0 0 C P U RS A0 LCM M C 6800 RW /R D 8 D 0 -D 7 A 14 D 0 -D 7 RS A 15 I n te r f a c e to M C S 5 1 C P U E /R D /W R LCM M C S51 D 0 -D 7 AKIHABARA INC. RW 8 Page 13 of 13 D 0 -D 7 SC802B VER2.1 b) Power supply Single Supply Voltage Types Dual Supply Voltage Types 5V +3V VDD VDD VDD VDD-VO LCM VDD-V0 VDD LCM 10k~20k VO VSS 1 Power on . ( SPLC780A1 starts initializing ) Function set RS R/W D7 D6 D5 D4 2 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 X X Display on / off control 0 0 0 0 0 0 0 1 1 1 0 0 Entry mode set 0 0 0 0 0 0 0 0 1 1 0 0 Write data to CG RAM / DD RAM 6 1 0 0 1 0 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. Function set 5 VEE VDD-VO:LCD driving voltage c) Operating example 4-Bit operation and 8-digit 1-line display (using internal reset) No Instruction Display 4 _ Display on. Cursor appears. _ 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. W_ Write “W “. The cursor is incremented by one and shifted to the right. 1 0 0 1 1 1 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: AKIHABARA INC. 10k~20k VSS GND VDD-VO:LCD driving voltage 3 VO Page 14 of 14 SC802B VER2.1 4bits interface Power on Waite time > 15ms after VDD>4.5V RS 0 R/W D7 D6 D5 D4 0 0 0 1 1 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 1 1 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 1 1 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 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 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 Initialization end AKIHABARA INC. Page 15 of 15