SSD1809
SOLOMON
21
REV 1.3
03/02
Data Read / Write
6800-Series Parallel Interface
To read data from the GDDRAM, input High to R/W pin and D/ C pin. Data are valid at the falling edge of CLK. And the GDDRAM column
address pointer will be increased by one automatically.
To write data to the GDDRAM, input Low to R/W pin and High to D/ C pin. Data which fulfil the data setup time, are input to the LCD driver at
the falling edge of CLK. And the GDDRAM column address pointer will be increased by one automatically.
80-Series Parallel Interface
To read data from the GDDRAM, input High to WR pin and D/C pin and RD is used as a clock input. Data are valid at the rising edge of RD.
And the GDDRAM column address pointer will be increased by one automatically.
To write data to the GDDRAM, input High to RD pin and D/C pin and WR pin is used as a clock input. Data which fulfil the data setup time,
are input to the LCD driver at the rising edge of WR. And the GDDRAM column address pointer will be increased by one automatically.
SPI Interface
Input High to D/C pin to write data to the GDDRAM. Data which fulfil the data setup time, are input to the LCD driver at the falling edge of
SCK. And the GDDRAM column address pointer will be increased by one automatically.
Read data from GDDRAM is not available.
No auto address pointer increment will be performed for the Dummy Write Data after Master Clear GDDRAM. (Refer to the “
Commands
Required for R/W Actions on RAM” Table)
Comment
Address Increment
Remarks
Write Command
No
Read Command
No (invalid mode)
*1
Write Data
Yes
*2, *3
Read Data
Yes
*3
Commands Required for R/W Actions on RAM
* No need to resend the command again if it is set previously.
The read / write action to the Display Data RAM does not depend on the display mode. This means the user can change the RAM content
whether the target RAM content is being displayed.
R/ W Actions on RAMs
Commands Required
Read/Write Data from/to GDDRAM.
Set GDDRAM Page Address
Set MSB of GDDRAM Column Address
Set GDDRAM Column Address
Read/Write Data
(000000X1X0)*
(0010011X0)*
(1X 6X5X4X3X2X1X0)*
(X 7X 6X5X4X3X2X1X0)
Save/Restore GDDRAM Column Address.
Save/Restore GDDRAM Column Address.
(0011010X0)
Master Clear GDDRAM
Set Clear Page GDDRAM (160 x 64 bits)
Dummy Write Data
(00110110)
(X 7X 6X5X4X3X2X1X0)
Master Clear Icon RAM
Set GDDRAM Page Address to Page 9
Master Clear Icon RAM (160 bits)
Dummy Write Data
(00001001)*
(00110111)
(X 7X 6X5X4X3X2X1X0)
Address Increment is done automatically data read write. The column address pointer of GDDRAM*3 is affected.
Remarks :
*1. Only data is read from RAM.
*2. If write data is issued after Command Clear RAM, Address increase is not applied.
*3. Column Address will be wrapped round when overflow.
Address Increment Table (Automatic)
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