HD66765 Datasheet, PDF (52/71 Pages) Hitachi Semiconductor – 396-channel Segment Driver with Internal RAM for 4096-color Displays

HD66765
3. Write mode 3: AM = 0, LG2–0 = 110/111
This mode is used when the data is horizontally written by comparing the write data and the set value
of the compare register (CP11–0). When the result of the comparison in a byte unit satisfies the
condition, the write data sent from the microcomputer is written to the GRAM. In this operation, the
write-data mask function (WM11–0) is also enabled. 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:
1) I/D = "1", AM = "0", LG2-0 = "110" (matched write)
2) CP11—0 = "530"H
n _{3) WM11—0 = "000"H}
tio ^{4) AC = "0000"H}
DB11
DB0
a _{Write-data mask:} 0 0 0 0 0 0 0 0 0 0 0 0
ific ^DB11
DB0
Compare register:
c _{Write data (1):}
Spe ^{Write data (2):}
010100110000
(Matched)
Compare
operaton
010100110000
C
000011110000
Compare
operaton
C
Conditional
replacement
R
Conditional
replacement
R
010100110000
Replacement
************
y _"0000"H
"0001"H
ar 0 1 0 1 0 0 1 1 0 0 0 0
Matched replacement
in of write data (1)
************
lim ^GRAM
"0002"H
Pre ^{Figure 38 Writing Operation of Write Mode 3}
52