ST7920STSitronixChin eseST7920Fonts built in LCD controller/driverV3.0#/42 2002/10/11ST7920V3.0#/42 2002/10/11ST7920Main FeaturesV3.0#/42 2002/10/11ST7920z Voltage operat ing ran ge:-2.7 to 5.5Vz Support 8 bit, 4 bit, serial bus MPU in terfacez 64 x 16-bits character display RAM (max. 16chars x 4 lin es, LCD display range 16 char. X 2 linesz 64 x 256-bits graphic display RAM (GDRAM ) z2M-bits Chin ese fonts ROM (CGROM)supporti ng 8192 Chi nese fonts (16x16 dot matrix)z 16K-bits half height ROM (HCGROM) supporti ng 126 character set (16x8 dot matrix)z 64 x 16-bits character gen eration RAM(CGRAM) z15 x 16-bits total 240 ICON RAM (IRAM )z33-com mon x 64-segme nt (2 lines display) LCDdriversz Automatic power on resetz External reset pi n (XRESET)z With exte nsion segme nt drivers display area can up to 16x2 linesz RC oscillator built in (with external R) z Low power desig nNormal mode (450uA Typ V DD=5V)Standby mode (30uA Max V dd =5V)z VLCD (V0 V ss)： max 7Vz Graphic and character mix modes display z Multiplein struct ions :-(Display clear )-(Return home )-(Display on/off )-(Cursor on/off )-(Display character blink )-(Cursor shift )-(Display shift )- (Vertical line scroll )-(By_line reverse display )-(Standby mode )z Built in voltage booster (2 times)z 1/33 DutyV3.0#/42 2002/10/11ST7920V3.0#/42 2002/10/11ST7920Function Descripti onST7920 LCD con troller/driver IC can display alphabets, nu mbers. Chin ese fon ts and self-defi ned characters. It supports 3 kinds of bus in terface, n amely 8 bit/ 4bit and serial. All functions, in clud ing display RAM, character generator ROM, LCD display drivers and control circuits are all in a one-chip solution. With a minimum system con figurati on, a Chin ese character display system can easily achieved.ST7920 in cludes character ROM with 8192 16X16 dots Chin ese fonts and 126 16X8 dots half height alpha nu merical fonts. Also for graphic display it supports 64x256 dots graphic display area (GDRAM ) and 240 dots ICON RAM. Mix mode display with both character and graphic data is possible. ST7920 has built in 4 sets CGRAM providi ng software programmable 16X16 font.ST7920 has wide operati ng voltage (2.7 V to 5.5 V) and low power con sumpti on suitable for battery power portable device.ST7920 LCD driver con sists of 33 com mon and 64 segme nts. Together with exte nsion segme nt driver ST7921, ST7920 can support up to 33 com mon x 256 segme nts display.Product FonttypeST7920-0ABIG-5 code traditi onal character setST7920-0BGB code simplified character setST7920-0CGB code,BIG-5 code and Japa nese codeST7920 Specification Revisi on HistoryVersi on DateDescripti onC1.7 2000/12/151. VCC cha nged to VDD.2. VLCD cha nged from VCC-V5 to V0-VSS.3. DC characteristics in put High voltage (Vih) cha nged to 0.7VDD.4. DC characteristics output High voltage (Voh) cha nged to 0.8VDD.C1.8 2001/03/011. Chip Size cha nged.2. ICON 256 dots chan ged to 240 dots.3. XOFF no rmal high sleep Low cha nged to no rmal low sleep High.4. Added XOFF applicati on.5. Modified 即plication of ST7920 4,5,6 PIN floating. (4,5,6爲 test pin)6. Modified voltage doubler CAP1P, CAP1M, CAP2M capacitors polarityC1.9 2001/05/281. Icon RAM TABLE chan ged. (TABLE-6)2. Booster description modified. (PAGE-29)3. AC Characteristics modified.4. Added 2Li ne 16 Chi nese Word (32Com X 256Seg) application circuit.5. Added oscillation resistor s relation to power consumption and frequencyC2.0 2001/07/031. Added Register in itial values.2. Voltage booster CAP1M CAP1P polarity chan ged. (PAGE-30)V2.0 2001/C8/171. Modified Table 7. (PAGE-14)2. Change to En glish version.V2.0c2001/10/181. Modified page-38 Serial in terface timi ng diagramV2.0d 2002/)5/091. Add the standard code (Japan 、GB code、BIG-5 code)V3.02002/10/111. Delete sleep mode functionV3.0#/42 2002/10/11ST7920V3.0#/42 2002/10/11ST7920System Block diagramRESIRESOPSBRS 一MPUInterfaceRWResetCircuitCL1CL2MInstructionDecoderCLKTimingGeneratorInstruction.Register (IR)DisplayData RAM(DDRAM)60 x 16 bitsDOUTAddressCounterInput/ Output BufferBusyFlagDB4 toDB7DB0 toDB3Data Register(DR)64-bit latch circuit64-bit shift registerSegmentSignal DriverCommonSignalDriverSEG1 toSEG6433/49-b it shift registerCOM1 toCOM33LCD Drive Voltage SelectorGraphicRAM(GRAM)1024x 16bitsHalf sizeCharacterROM(HCGROM)1024x16 bitsCharacterGeneratorRAM(CGRAM)1024 bitsCharacterGen eratorROM(CGROM)2M bitsCursorBlinkScrollControllerVssParallel/Serial converterandAttribute CircuitVDDXRESET V0 V1 V2 V3 V4XOFF