SSD1820A View Datasheet(PDF) - Solomon Systech
Part Name
Description
Manufacturer
SSD1820A Datasheet PDF : 43 Pages
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E8
1 1 1 0 1 0 0 0 Set Display Data Length
D7 D6 D5 D4 D3 D2 D1 D0
E9~EF
Reserved
F0~FF 1 1 1 1 x x x x Extended Features
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
Reserved
Test mode commands and Extended features, see
Extended Command Table.
EXTENDED COMMAND TABLE
Bit Pattern
11110001
00001X2X1X0
11110010
0010X3X2X1X0
Command
X2X 1X0 : Set TC Value
X3: Select Oscillator Source
X2X 1X0: Set Oscillator Value
11111101
00010L10
Other than above
L : Interface Lock / Unlock
Reserved
Comment
X2X 1X0 = 000: -0.05%/C (POR for 1820A)
X2X 1X0 = 001: -0.07%/C (POR for 1821)
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%
L = 0 Interface Unlock (POR)
L = 1 Interface Lock
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.
D7
D6
D5
D4
D3
D2
D1
D0
Comment
BUSY ON RES 0
1
0
0
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
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-
SSD1820A/21 REV 1.4
20
01/03
SOLOMON
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