hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 105

• 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
Window Address Function
The window address function enables consecutive data write within the rectangular window-address area
on the on-chip GRAM, which is specified with horizontal address registers (start: HSA7-0, end: HEA 7-0)
and vertical address registers (start: VSA7-0, end: VEA7-0).
The address transition direction is determined with AM bits (either increment or decrement). Accordingly,
the data, including picture data, are written consecutively without taking the data wrap position into
consideration.
The window-address range must be specified within the GRAM address area. An address set must be set
within the window-address range.
[Condition on setting window-address range]
[Condition on making an address set within the window-address range]
Note: In high-speed RAM write mode , the lower two bits of the address must be set as follows.
Rev.0.12, May 09 2003, page 105 of 156
ID0 0: The lower two bits of the address must be set to 11.
ID0 1: The lower two bits of the address must be set to 00.
(horizontal direction)
(vertical direction)
(RAM address)
Address transition direction in specified window-address range
“EF00”H
“0000”H
Window address range specification area
HSA7-0 = “10”H, HSE7-0 = “2F”H
VSA7-0 = “20”H, VEA7-0 = “5F”H
“5F10”H
“2010”H
“2110”H
00H d HSA7-0 d HSA7-0 d AFH
00H d VSA7-0 d VEA7-0 d EFH
HSA7-0 d AD7 -0 d HEA7-0
VSA7-0 d AD15-8 d VEA7-0
Window address area
GRAM address map
I/D = 1 (increment)
AM = 0 (horizontal writing)
“202F”H
“212F”H
“5F2F”H
“00AF”H
“EFAF”H
Preliminary