ST7781
11.1.15 Power Control 4 (R13h)
Power Control 4 (R13h)
D15 D14 D13 D12 D11 D10 D9 D8
VDV4 VDV3 VDV2 VDV1 VDV0
RS
/WR
/RD
D7
0
D6
0
D5
0
D4
0
D3
0
D2
0
D1
0
D0
0
0
0
0
0
0
0
1
↑
1
0
0
1
1
1
0
1
1
1
0
0
0
0
Default value
VDV [4:0]: Selects the factor of GVDD to set the amplitude of VCOM alternating voltage from 0.70 to 1.24.
VDV[4:0]
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
VCOM Amplitude
GVDD X 0.70
GVDD X 0.72
GVDD X 0.74
GVDD X 0.76
GVDD X 0.78
GVDD X 0.80
GVDD X 0.82
GVDD X 0.84
GVDD X 0.86
GVDD X 0.88
GVDD X 0.90
GVDD X 0.92
GVDD X 0.94
GVDD X 0.96
GVDD X 0.98
GVDD X 1.00
VDV[4:0]
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
VCOM Amplitude
GVDD X 1.02
GVDD X 1.04
GVDD X 1.06
GVDD X 1.08
GVDD X 1.10
GVDD X 1.12
GVDD X 1.14
GVDD X 1.16
GVDD X 1.18
GVDD X 1.20
GVDD X 1.22
GVDD X 1.24
GVDD X 1.24
GVDD X 1.24
GVDD X 1.24
GVDD X 1.24
Description
Note :Set VDV[4:0] to let VCOM amplitude less than 6V
11.1.16 DRAM Horizontal/Vertical Address Set (R20h, R21h)
DRAM Horizontal/Vertical Address Set (R20h,R21h)
RS
/WR
/RD D15 D14 D13 D12 D11 D10 D9
D8
D7
AD7
0
D6
AD6
0
D5
AD5
0
D4
AD4
0
D3
AD3
0
D2
AD2
0
D1
AD1
0
D0
AD0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
↑
1
0
Default value
AD16 AD15 AD14 AD13 AD12 AD11 AD10 AD9
AD8
0
1
↑
1
0
0
0
0
0
0
0
0
Default value
AD [16:0]: A DRAM address set initially in the AC (Address Counter). The address in the AC is automatically
updated according to the combination of AM, I/D[1:0] settings as the ST7781 writes data to the internal
DRAM so that data can be written consecutively without resetting the address in the AC.
AD[16:0]
DRAM Data Map
17’h00000~17’h000EF
17’h00100~17’h001EF
17’h00200~17’h002EF
17’h00300~17’h003EF
.
1st line DRAM Data
2nd line DRAM Data
3rd line DRAM Data
4th line DRAM Data
.
Description
.
.
.
.
17’h13D00~17’h13DEF
17’h13E00~17’h13EEF
17’h13F00~17’h13FFE
318th line DRAM Data
319th line DRAM Data
320h line DRAM Data
Ver. 1.7
57
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
