ST7781
11.1.17 Write Data to DRAM (R22h)
Write Data to DRAM (R22h)
RS
/WR
/RD D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
↑
1
WD [17:0] - DRAM Write Data
WD [17:0]: The ST7781 develops data into 18 bits internally in write operation. The format to develop data into 18
bits is different in different interface operation. The DRAM data represents the grayscale level. The
DRAM data represents the grayscale level. ST7783 automatically updates the address to the begin point
according to AM and I/D[1:0] settings as it’s wrote this register. The DFM bit sets the format to develop
16-bit data into the 18-bit data in 16-bit or 8-bit interface operation.
Description
11.1.18 Read Data from DRAM (R22h)
Read Data from DRAM (R22h)
RS
/WR
/RD D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
1
↑
RD [17:0] - DRAM Read Data
RD [17:0]: 18-bit data read from the DRAM. RAM read data RD [17:0] is transferred via different data bus in different
interface operation. When the ST7781 reads data from the DRAM to the microcomputer, the first word
read immediately after RAM address set is executed is taken in the internal read-data latch and invalid
data is sent to the data bus. Valid data is sent to the data bus when the ST7781 reads out the second and
subsequent words. When either 8-bit or 16-bit interface is selected, the LSBs of R and B dot data are not
read out.
Description
Ver. 1.7
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SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
