hd66765 Renesas Electronics Corporation., hd66765 Datasheet - Page 48

Manufacturer Part Number

hd66765

Description

396-channel Segment Driver With Internal Ram For 4096-color Displays - Hitachi Semiconductor

Manufacturer

Renesas Electronics Corporation.

Datasheet

1.HD66765.pdf (71 pages)

HD66765

Write-data Mask Function

The HD66765 has a bit-wise write-data mask function that controls writing the two-byte data from the

microcomputer to the GRAM. Bits that are 0 in the write-data mask register (WM11–0) cause the

corresponding DB bit to be written to the GRAM. Bits that are 1 prevent writing to the corresponding

GRAM bit to the GRAM; the data in the GRAM is retained. This function can be used when only one-

pixel data is rewritten or the particular display color is selectively rewritten.

Data written by

the microcomputer

Write-data mask

GRAM data

Figure 35 Example of Write-data Mask Function Operation

DB11

DB0