HD66766R Datasheet, PDF (53/97 Pages) Hitachi Semiconductor – 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors

HD66766R
Rev. 1.0-1 / September 2002
Graphics Operation Processing
1. Write mode 1: AM = 0, LG2-0 = “000”
This mode is used when the data is horizontally written at high speed. It can also be used to initialize
the graphics RAM ( GRAM ) or to draw borders. The write-data mask function ( WM15-0 ) are also
enabled in these operations. After writing, the address counter ( AC ) automatically increments by 1
( I/D = 1 ) or decrements by 1 ( I/D = 0 ) , and automatically jumps to the counter edge one-raster
below after it has reached the left or right edge of the GRAM.
Operation Examples:
1) I/D = "1", AM = "0", LG2-0 = "000"
2) WM15-0 = "07FF"H
3) AC = "0000"H
Write data mask:
WM15
WM0
0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 ^{"Write mask for plane G and B.}
Write data (1) :
Write data (2) :
DB15
DB0
1 00 11 11 1 10 01 010 0
11 0 0 0000 00 1 1 00 00
"0000"H
"0001"H
"0002"H
1 0 0 11 **** * ** * ** * ^{11 00 0* * ** *** *** *}
Write data (1)
Write data (2)
GRAM
Note: The bits in the GRAM
indicated by (*) are not changed.
Figure 39 Writing Operation of Write Mode 1
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