hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 34

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.

Datasheet

1.HD66789.pdf (156 pages)

HD66789

HWM: When HWM=1, data are written to GRAM in high speed. In high-speed write mode, 4 words are

written to GRAM in a single operation after executing 4 RAM write operations. If RAM write is

terminated before it is executed 4 times, the last data will not be written. Make sure that RAM write is

executed 4 times. For this reason, the lower 2 bits must be set to “0” when setting the RAM address. For

details, see “High-Speed RAM Write Mode” section.

I/D1-0: The address counter is automatically incremented by 1, after data are written to GRAM when I/D1-

0 = “1”. The address counter is automatically decremented by 1, after data are written to GRAM when

I/D1-0 = “0”. An independent setting for the increment or decrement of the address counter can be made to

the upper (AD15-8) and the lower (AD7-0) bits of the address. The address transition direction when data

are written to GRAM is set with AM bits.

AM: Set the direction of updating address counter automatically after data are written to GRAM. When

AM = “0”, the address counter is updated in the horizontal direction. When AM = “1”, the address counter

is updated in the vertical direction. When the window address is specified, data are written to the GRAM

area specified by the window address in the manner specified with I/D1-0, AM bits.

Rev.0.12, May 09 2003, page 34 of 156

TRI

DFM1 DFM0

DB17 DB16 DB15 DB14 DB13 DB12

First transmission

8-bit interface data format

DB17 DB16 DB15 DB14 DB13 DB12

DB11 DB10

Setting disabled

Second transmission

DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10

Second transmission

DB17 DB16 DB15 DB14 DB13 DB12

Third transmission

Preliminary