hd66765 Renesas Electronics Corporation., hd66765 Datasheet - Page 52

• Manufacturer Part Number: hd66765
• Description: 396-channel Segment Driver With Internal Ram For 4096-color Displays - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HD66765
3. Write mode 3: AM = 0, LG2–0 = 110/111
Operation Examples:
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.
1) I/D = "1", AM = "0", LG2-0 = "110" (matched write)
2) CP11—0 = "530"H
3) WM11—0 = "000"H
4) AC = "0000"H
Write-data mask:
Compare register:
Write data (1):
Write data (2):
0 1 0 1 0 0 1 1 0 0 0 0
Matched replacement
of write data (1)
"0000"H
DB11
DB11
0
0
0 1 0 1 0 0 1 1 0 0 0 0
0 0 0 0 1 1 1 1 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0
1 0 1 0 0 1 1 0 0 0 0
Figure 38 Writing Operation of Write Mode 3
(Matched)
* * * * * * * * * * * *
GRAM
"0001"H
DB0
DB0
52
Compare
operaton
Compare
operaton
C
C
Conditional
replacement
Conditional
replacement
R
R
0 1 0 1 0 0 1 1 0 0 0 0
* * * * * * * * * * * *
"0002"H
Replacement