ST7781
The ST7781 also support function that automatically updates the address according to AM and I/D[1:0] settings as it
read data continuously address in the DRAM
11.1.19 VCOMH Control (R29h)
VCOMH Control (R29h)
RS
/WR
/RD D15 D14 D13 D12 D11 D10 D9
D8
D7
D6
0
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
VCM5 VCM4 VCM3 VCM2 VCM1 VCM0
1
↑
1
0
0
0
0
0
0
0
0
0
Default value
VCM [5:0]: Sets a factor of GVDD from 0.685 to 1.00 to generate the VCOMH voltage (Higher level of VCOM
alternating voltage). VCOMH voltage can be set either by internal electronic volume or external resistor.
Set the VCMR bit to select either external resistor or internal electronic volume for VCOMH adjustment.
VCM[5:0]
000000
000001
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
001100
001101
001110
001111
010000
010001
010010
010011
010100
010101
VCOMH
VCM[5:0]
100000
100001
100010
100011
100100
100101
100110
100111
101000
101001
101010
101011
101100
101101
101110
101111
110000
110001
110010
110011
110100
110101
VCOMH
GVDD X 0.685
GVDD X 0.690
GVDD X 0.695
GVDD X 0.700
GVDD X 0.705
GVDD X 0.710
GVDD X 0.715
GVDD X 0.720
GVDD X 0.725
GVDD X 0.730
GVDD X 0.735
GVDD X 0.740
GVDD X 0.745
GVDD X 0.750
GVDD X 0.755
GVDD X 0.760
GVDD X 0.765
GVDD X 0.770
GVDD X 0.775
GVDD X 0.780
GVDD X 0.785
GVDD X0.790
GVDD X 0.845
GVDD X 0.850
GVDD X0.855
GVDD X 0.860
GVDD X 0.865
GVDD X0.870
GVDD X0.875
GVDD X 0.880
GVDD X 0.885
GVDD X0.890
GVDD X 0.895
GVDD X 0.900
GVDD X0.905
GVDD X 0.910
GVDD X 0.915
GVDD X0.920
GVDD X 0.925
GVDD X 0.930
GVDD X 0.935
GVDD X 0.940
GVDD X 0.945
GVDD X 0.950
Description
Ver. 1.7
59
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
