UPD7228 datasheet(4/39 Pages) NEC

4 / 39 page

Data Sheet S10299EJ4V0DS00

µµµµ PD16434

TABLE OF CONTENTS

1. PIN FUNCTIONS ………………………………………………………………………………………………

1.1 D0 to D3 (Data Bus) … 3-state input/output ……………………………………………….………………….....

1.2 SI (Serial Data In) … Also serves as D0 input ……………………………………………………….………..…

1.3 SO (Serial Data Out) … Also serves as D3 output ………………………………….……………….………….

1.4 P, /S (Parallel/Serial Select) … Also serves as D1 input ………………………………………………………

1.5 CAE (Chip Address Enable) … Also serves as D2 input ………………………………………………………

1.6 CA0, CA1 (Chip Address) … Input …………………………………………………………………………………

1.7 /CS (Chip Select) … Input …………………………………………………………………………………………...

1.8 /STB, /SCK (Strobe/Serial Clock) … Input .……………………………………………………….………………

1.9 C, /D (Command/Data) … Input ………………………………………………………………….…………………

1.10 /BUSY (Busy) … 3-state output …………………………………………………………………………………..

1.11 SYNC (Synchronous) … 3-state input/output ………………………………………………………………….

1.12 C0 to C41 (Column) … Output …………………………………………..………………………………………..

1.13 R8/C49 to R15/C42 (Row/Column) … Output ..…………………………………………...…………………….

1.14 R0/R8 to R7/R15 (Row) … Output .………………………….…………………………………………………….

1.15 VLC1 to VLC5 (LCD Drive Voltage Supply) … Input ……………….…………………………….………………

1.16 CLOCK (Clock) … Input ……………………………………………………………………………………………

1.17 RESET (Reset) … Input ………………………………………………………………….…………………………

1.18 VDD ……………………………………………………………………………………………………….….……….…

1.19 VSS …………………………………………………………………………………………………………..……….…

2. INTERNAL BLOCK FUNCTIONS …………………………………………………………………………..

2.1 Serial/Parallel Interface ……………………………………………………………………………………………...

2.2 Command Decoder …………………………………………………………………………………………………..

2.3 Character Generator …………………………………………………………………………………………………

2.4 Data Pointer ……………………………………………………………………………………………………………

2.5 Data Memory …………………………………………………………………………………………………………..

2.6 LCD Voltage Control Circuit ………………………………………………………………………………………..

2.7 LCD Timing Control Circuit …………………………………………………………………………………………

2.8 Row/Column Driver …………………………………………………………………………………………………..

3. DATA INPUT/OUTPUT OPERATION ………………………………………………………………………

4. SELECTING

µµµµ PD16434 INTERFACE FUNCTION WITH CPU …………………………………………

4.1 Functions of Shared Pins ……………………………………………………………………………………………

4.2 Chip Address Selection Function ………………………………………………………………….………………

5. LCD DRIVE REFERENCE VOLTAGE SUPPLY …………………………………………………………..

5.1 Supplying LCD Drive Reference Voltage by Resistor Network ………………………………………………

5.2 Reduction in Current Consumption by RESET Signal …………………………………………………………

6. DISPLAY EXAMPLES ………………………………………………………………………………………..

7. STANDBY MODE ……………………………………………………………………………………………..

7.1 Clearing Standby Mode ……………………………………………………………………………………………..

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