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| Datasheet File OCR Text: |
| UPD6454GT (1/2) IL04 C-MOS ON SCREEN CHARACTER DISPLAY --TOP VIEW-- CLK IN 1 24 AFDO OUT AGND 23 1 3 CLK DATA CS IN 2 DATA IN 3 4 DVDD (+5 V) OSC OUT 5 OSC IN 6 2 22 AFDI IN 6 CS 5 21 SSCR IN/OUT 22 OSC IN OSC OUT 20 SSIN 19 VBSI IN 18 VCNT IN 18 21 20 AFDI AFDO HSYO 24 15 SSCR SSIN SDE VSYO 13 14 PCL IN 7 XOSO OUT 8 XOSI IN 9 10 DGND VC OUT 11 VBLK OUT 12 17 VBSO OUT 9 VCNT 8 AVDD 16 (+5 V) 19 XOSI XOSO 15 14 HSYO OUT VSYO OUT 7 VBSI VC VBLK VBSO 11 12 17 PCL 13 SDE OUT INPUT/OUTPUT SSCR : SYNCHRONISM SEPARATION (CAPACITOR AND RESISTOR) CONNECTOR INPUT AFDI : VCO FREQUENCY DIFFERENCE VOLTAGE FOR AFC CLK : CLOCK : CHIP SELECT CS DATA : SERIAL DATA OSC IN : OSCILLATOR FOR DOT CLOCK GENERATOR : POWER ON CLEAR PCL SSIN : COMPOSITE VIDEO SIGNAL FOR SYNCHRONISM SEPARATION VBSI : COMPOSITE VIDEO SIGNAL VCNT : OUTPUT LEVEL ADJUSTMENT FOR COMPOSITE VIDEO SIGNAL AND Y SIGNAL XOSI : CRYSTAL OUTPUT AFDO : VCO FREQUENCY DIFFERENCE VOLTAGE FOR AFC HSYO : HORIZONTAL SYNCHRONISING SIGNAL OSC OUT : OSCILLATOR FOR DOT CLOCK GENERATOR : SYNCHRONISM DETECTOR SDE : VERTICAL BLANKING VBLK : COMPOSITE VIDEO SIGNAL VBSO : CHARACTER SIGNAL VC : VERTICAL SYNCHRONISING SIGNAL VSYO : CRYSTAL XOSO UPD6454GT (2/2) DATA CLK 3 1 DATA INPUT SHIFT REGISTER INSTRUCTION DECODER SHIFT REGISTER CONTROL SIGNAL 7 CS 2 PCL EXTERNAL/ INTERNAL REGISTER NTSC/PAL REGISTER CHARACTER SIZE REGISTER HORIZONTAL ADDRESS REGISTER WRITE ADDRESS COUNTER DATA SELECTOR VIDEO RAM CHARACTER PRINTER DATA DATA 1 BITS 8 BITS x x 288 WORD 288 WORD DISPLAY CONTROL DATA REGISTER HORIZONTAL SIZE COUNTER HORIZONTAL POSITION COUNTER HORIZONTAL ADDRESS COUNTER VERTICAL ADDRESS REGISTER OSC IN 6 OSC OUT 5 OSCILLATOR CIRCUIT TIMING GENERATOR VERTICAL SIZE COUNTER VERTICAL POSITION COUNTER VERTICAL ADDRESS COUNTER CHARACTER GENERATOR ROM 12 x 18 BITS x 256 WORD BACKGROUND CONTROL DATA REGISTER 22 AFDI 24 AFDO 15 VCO SYNCHRONISM SEPARATE CIRCUIT 14 13 20 21 SYNCHRONISM DETECT CIRCUIT MODE SWITCH SYNCHRONISM SIGNAL GENERATOR 18 CRYSTAL OSCILLATOR CIRCUIT 12 8 9 OUTPUT CONTROLLER 11 17 19 VBSI XOSO HSYO VSYO SSIN SSCR VBSO VCNT XOSI VBLK SDE VC |
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