hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 109

• Manufacturer Part Number: hd66789
• Description: 528-channel, One-chip Driver For Amorphous Tft Panels With 262,144-color Display Ram, Power Supply Circuit, And Gate Circuit
• Manufacturer: Renesas Electronics Corporation.

HD66789
3. Write mode 3: AM = 0, LG2–0 = 110/111
This mode is used when data are horizontally written with comparing the write data and the value set in the
compare register (CP17–0) by R, G, B pixel. When the result of the comparison satisfies a condition, the
write data sent from the microcomputer are written to GRAM. The write-data mask function (WM17–0) is
also available with this mode. After writing, the address counter (AC) automatically increments by 1 (I/D
= 1) or decrements by 1 (I/D = 0), and jumps to the counter at the opposing edge of the next one-raster-row
below after when the counter reaches either left or right edge of GRAM.
Rev.0.12, May 09 2003, page 109 of 156
Compare register:
0 0 0
Write-data mask:
Operation example
1) I/D = "1", AM = "0", LG2-0 = "110" (matched writing)
2)CP17-0 = "050C0"H
3)WM17-0 = "00000"H
4) AC = "0000"H
Write-data (2):
Write-data (1):
write data (1)
matched
replacement
1
0 1
"0000"H
0
0
Data are expanded into 18 bits in 8/16-bit system
interface, and 16-bit RGB interface modes.
DB17
0 0 0
0 0 0
0 0 0
0 0 0
CP17
WM17
0
0
1
0
1
1
0
1 0
0 0
0 1
0 1
0 0
0
0
0
0
1
0 0
(Matched)
0
0
0
1
0
0
0
1
0
0
0
0
1
0
0
1
1
1
* * *
0 0
1 0
1 0
1 0
Write Mode 3
0
0
0
0
*
0 0
0 0
0 0
0 0
* *
Compare
operation
CP0
0
0
0
0
WM0
"0001"H
DB0
*
0
0
0
0
*
C
Compare operation
*
C
*
*
Conditional replacement
Conditional replacement
R
R
* *
*
0 0 0 0 1 0 0 1 0 0 0 0
* * *
* *
GRAM
*
1
*
*
* *
Replacement
0
*
*
0
*
*
1
*
* *
0
*
* *
Preliminary
0
*
*