HD66765 Datasheet, PDF (50/71 Pages) Hitachi Semiconductor – 396-channel Segment Driver with Internal RAM for 4096-color Displays

HD66765
Graphics Operation Processing
1. Write mode 1: AM = 0, LG2–0 = 000
This mode is used when the data is horizontally written at high speed. It can also be used to initialize
the graphics RAM (GRAM) or to draw borders. The write-data mask function (WM11–0) is also
enabled in these operations. After writing, the address counter (AC) automatically increments by 1
(I/D = 1) or decrements by 1 (I/D = 0), and automatically jumps to the counter edge one-raster-row
below after it has reached the left or right edge of the GRAM.
Operation Examples:
n _{1) I/D = "1", AM = "0", LG2-0 = "000"}
tio ^{2) WM11—0 = "0FF"H}
3) AC = "0000"H
a ^DB11
DB0
ific ^{Write-data mask: 0 0 0 0 1 1 1 1 1 1 1 1 *Write mask for plain <G> and <B>.}
c Write data (1):
e _{Write data (2):}
DB11
DB0
100110010100
110000110000
Sp _"0000"H
"0001"H
"0002"H
y ^{1 0 0 1 * * * * * * * * 1 1 0 0 * * * * * * * *}
r _{Write data (1)}
Write data (2)
ina _GRAM
Note: The bits in the GRAM
indicated by ’*’ are not changed.
Prelim^{Figure 36 Writing Operation of Write Mode 1}
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