HD66765 Datasheet, PDF (51/71 Pages) Hitachi Semiconductor – 396-channel Segment Driver with Internal RAM for 4096-color Displays

HD66765
2. Write mode 2: AM = 1, LG2–0 = 000
This mode is used when the data is vertically written at high speed. It can also be used to initialize
the GRAM, develop the font pattern in the vertical direction, or draw borders. The write-data mask
function (WM11–0) is also enabled in these operations. After writing, the address counter (AC)
automatically increments by 256, and automatically jumps to the upper-right edge (I/D = 1) or upper-
left edge (I/D = 0) following the I/D bit after it has reached the lower edge of the GRAM.
Operation Examples:
1) I/D = "1", AM = "1", LG2-0 = "000"
2) WM11—0 = "0FF"H
3) AC = "0000"H
n _DB11
DB0
tio ^{Write-data mask: 0 0 0 0 1 1 1 1 1 1 1 1}
ifica ^{Write data (1):}
Write data (2):
c _{Write data (3):}
DB11
DB0
100110010100
110000110000
011101000001
Spe "0000"H
"0001"H
ry _"0002"H
1 0 0 1 * * * * * * * * Write data (1)
1 1 0 0 * * * * * * * * Write data (2)
0 1 1 1 0 1 0 0 0 0 0 1 Write data (3)
ina _GRAM
lim^{Note: 1. The bits in the GRAM indicated by ’*’ are not changed.}
2. After writin to address "AF00"H, the AC jumps to "0001"H.
Pre ^{Figure 37 Writing Operation of Write Mode 2}
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