SSD1821 datasheet(20/43 Pages) ETC1

20 / 43 page

SSD1820A/21

REV 1.4

01/03

SOLOMON

EXTENDED COMMAND TABLE

Read Status Byte

A 8 bits status byte will be placed to the data bus if a read operation is performed if D/C is low. The status byte is defined as follow.

Data Read / Write

To read data from the GDDRAM, input High to R/W(WR) pin and D/C pin for 6800-series parallel mode, Low to E(RD) pin and High to D/

C pin for 8080-series parallel mode. No data read is provided for serial mode. In normal mode, GDDRAM column address pointer will be

increased by one automatically after each data read. Also, a dummy read is required before the first data is read. See Figure 4 in Func-

Set Display Data Length

This command is valid only at 3-wire SPI (PS0=PS1=L)

The next command specifies the number of bytes of dis-

play data to be written after this composite command.

D(7:0)=00: 1 byte of display data is to be sent

D(7:0)=FF: 256 bytes of display data is to be sent

E9~EF

Reserved

F0~FF

Extended Features

Test mode commands and Extended features, see

Extended Command Table.

Bit Pattern

Command

Comment

11110001

00001X2X1X0

X2X 1X0 : Set TC Value

X2X 1X0 = 000: -0.05%/C (POR for 1820A)

X2X 1X0 = 001: -0.07%/C (POR for 1821)

11110010

0010X3X2X1X0

X3: Select Oscillator Source

X2X 1X0: Set Oscillator Value

X3 = 0: Internal RC oscillator is selected (POR)

X3 = 1: External oscillator from CL pin is selected

if X3 = 0,

X2X1X0 = 000: -16%

X2X1X0 = 001: -10%

X2X1X0 = 010: 0% (POR)

X2X1X0 = 011: +10%

X2X1X0 = 100: +16%

X2X1X0 = 101: +30%

X2X1X0 = 110: +54%

X2X1X0 = 111: +81%

11111101

00010L10

L : Interface Lock / Unlock

L = 0 Interface Unlock (POR)

L = 1 Interface Lock

Other than above

Reserved

Comment

BUSY

RES

DS0

BUSY=0: Chip is idle

BUSY=1: Chip is executing instruction

ON=0: Display is OFF

ON=1: Dispaly is ON

RES=0: Chip is idlex

RES=1: Chip is executing reset

DS0=0: SSD1820A; DS0=1:SSD1821

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