HD66750 Datasheet, PDF (44/96 Pages) Hitachi Semiconductor – 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions

HD66750/1
Operation Examples:
1) I/D = 1, AM1Ð0 = 00, LG1Ð0 = 00, RT2Ð0 = 000
2) WM15Ð0 = 0000H
3) AC = 000H
WM0
WM15
Write data mask: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
DB0
DB15
Write data (1) : 1 0 0 1 1 0 0 1 0 1 0 0 0 0 1 1
Write data (2) : _{1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 0}
Write data (3) : _{0 1 1 1 0 1 0 0 0 0 0 1 1 1 1 1}
000H
001H
002H
1 00 11 00 10 10 00 01 1 11 00 00 1 100 00 1 100 01 1 10 100 00 0 11 11 1
Write data (1)
Write data (2)
Write data (3)
CGRAM
Figure 26 Writing Operation of Write Mode 1
2. Write mode 2: AM1Ð0 = 01, LG1Ð0 = 00
This mode is used when the data is vertically written at high speed. It can also be used to initialize the
graphics RAM (CGRAM), develop the font pattern in the vertical direction, or 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 16, and automatically jumps to the
upper-right edge (I/D = 1) or upper-left edge (I/D = 0) following the I/D bit after it has reached the lower
edge of the graphics RAM.
Operation Examples:
1) I/D = 1, AM1Ð0 = 01, LG1Ð0 = 00, RT2Ð0 = 010
2) WM15Ð0 = F007H
3) AC = 000H
WM0
WM15
Write data mask: 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 1
DB0
DB15
Write data (1) : 1 0 0 1 1 0 0 1 0 1 0 0 0 0 1 1 ^{4-bit rotation}
Write data (2) : 1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 0 ^{4-bit rotation}
Write data (3) : 0 1 1 1 0 1 0 0 0 0 0 1 1 1 1 1 ^{4-bit rotation}
00 1 110 0 110 0 10 100
1 100 11 00 00 1 100 00
1 11 101 1 10 100 00 0 1
000H
010H
020H
* * * 1 1 0 0 1 1 0 0 1 * * * * Write data (1)
* * * 0 1 1 0 0 0 0 1 1 * * * * Write data (2)
* * * 1 0 1 1 1 0 1 0 0 * * * * Write data (3)
CGRAM
Notes: 1. The bit area data in the RAM indicated by '*' is not changed.
2. After writing to address 7F0H, the AC jumps to 001H.
Figure 27 Writing Operation of Write Mode 2
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