HD66750 Datasheet, PDF (43/96 Pages) Hitachi Semiconductor – 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions

+1/Ð1 +16
Address
counter
(AC)
11
Microcomputer
16
16
Read-
data
latch
Write-data latch
16
16
Bit rotation
16
Logical operation
16
Write bit mask
Graphics RAM
(CGRAM)
HD66750/1
HD66750/1
3
Rotation bit
(RT2Ð0)
2
Logical _{00: through}
operation _{01: OR}
bit
10: AND
(LG1Ð0) ^{11: EOR}
16
Write-mask register
(WM15Ð0)
Figure 25 Data Processing Flow of the Graphics Bit Operation
1. Write mode 1: AM1Ð0 = 00, LG1Ð0 = 00
This mode is used when the data is horizontally written at high speed. It can also be used to initialize the
graphics RAM (CGRAM) or to draw borders. The rotation function (RT2Ð0) or write-data mask
function (WM15Ð0) 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 edge of the graphics RAM.
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