HD66760 Datasheet, PDF (54/105 Pages) Hitachi Semiconductor – 104 X 80-dot Graphics LCD Controller/Driver for 256 Colors

HD66760
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 swap function (SWP) and 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-row below after it has reached the left or right edge of the GRAM.
Operation Examples:
1) I/D = "1", AM = "0", LG2-0 = "000", SWP = "0"
2) WM15–0 = "1F1F"H
3) AC = "000"H
WM15
WM0
Write-data mask:
00 01 11 11 00 01 11 11
*Write mask for plain G and B.
Write data (1):
DB15
DB0
10 0 110 0 10 100 00 1 1
Write data (2):
11 00 00 1 100 00 1 100
"0000"H
"0001"H
"0002"H
10 0 * * * * * 0 10 * * * * * 11 0* * * * * 00 0* * * * *
Write data (1)
Write data (2)
GRAM
Note: The bits in the GRAM
indicated by '*' are not changed.
Figure 34 Writing Operation of Write Mode 1