hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 108

• 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
2.
This mode is used when data are vertically written in high-speed mode. It is also used to initialize the
graphics RAM (GRAM), develop font patterns or draw a line vertically. The write-data mask function
(WM17–0) is also available with this mode. After writing, the address counter (AC) automatically
increments by 256, and automatically jumps to the counter either at the top of the next right row (ID = 1) or
at the top of the next left row (I/D = 0) according to the setting in the I/D bit, when the address reaches the
bottom of GRAM.
Rev.0.12, May 09 2003, page 108 of 156
Write mode 2: AM = 1, LG2–0 = 000
Operation example
1) I/D = "1", AM = "1", LG2-0 = "000"
2) WM17-0 = "00FFF"H
3) AC = "0000"H
Write-data mask:
Write-data (2):
Write-data (1):
Write-data (3):
“0000”H
“0001”H
“0002”H
Note 1) The bits in the GRAM with “ * ” are not overwritten.
Note 2) After writing data to the address "EF00"H, the address counter jumps to
"0001"H.
1 0 0
1 1 0
0 1 1
0 0 0
DB17
1 0 0
1 1 0
0 1 1
WM17
1
0
1
1 1
0 1
1 0
0
1
0
1
0 0
1 1
0 1
1 0
*
*
*
*
*
*
1
1
0
1
*
*
*
1
1
0
0
*
*
*
1
1
0
0
*
*
*
1
1
0
0
* *
* *
* *
Write Mode 2
1
0
0
1
1 1
0 1
1 1
0 0
*
*
*
* *
* *
* *
1
0
0
0
1 1
1 0
0 0
0 0
*
*
*
*
*
*
1
0
0
1
WM0
DB0
Write-data (1)
Write-data (2)
Write-data (3)
1
0
0
1
Data are expanded into 18 bits in 8/16-bit system
interface, and 16-bit RGB interface modes.
GRAM
Preliminary