HD66750 Datasheet, PDF (45/96 Pages) Hitachi Semiconductor – 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions

HD66750/1
3. Write mode 3: AM1Ð0 = 10, LG1Ð0 = 00
This mode is used when the data is written at high speed by vertically shifting bits. It can also be used to
write the 16-bit data for two words into the graphics RAM (CGRAM), develop the font pattern, or
transfer the BiTBLT as a bit unit. The rotation function (RT2Ð0) or write-data mask function(WM15Ð0)
are also enabled in these operation. However, although the write-data mask function masks the bit
position set with the write-data mask register (WM15Ð0) at the odd-times (such as the first or third)
write, the function masks the bit position that reversed the setting value of the write-data mask register
(WM15Ð0) at the even-times (such as the second or fourth) write. After the odd-times writing, the
address counter (AC) automatically increments by 1 (I/D = 1) or decrements by 1 (I/D = 0). After the
even-times writing, the AC automatically increments or decrements by Ð1 + 16 (I/D = 1) or +1 + 16 (I/D
= 0). The AC automatically jumps to the upper edge after it has reached the lower edge of the graphics
RAM.
Operation Examples:
1) I/D = 1, AM1Ð0 = 10, LG1Ð0 = 00, RT2Ð0 = 010
2) WM15Ð0 = 0007H
3) AC = 000H
WM0
WM15
Write data mask: _{1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0}
Write data (1) :
Write data (2) :
Write data (3) :
Write data (4) :
Write data (5) :
Write data (6) :
DB0
DB15
4-bit rotation
11 1 111 0 00 001 10 0 0
4-bit rotation
11 11 11 0 000 01 1 000
0 0 0 0 0 1 1 1 0 0 0 0 1 1 1 1 ^{4-bit rotation}
4-bit rotation
00 0 00 111 00 0 01 11 1
4-bit rotation
00 1 00 00 11 11 11 00 0
0 0 1 0 0 0 0 1 1 1 1 1 1 0 0 0 ^{4-bit rotation}
10 0 011 1 111 0 00 001
1 000 11 11 11 0 000 01
1 11 100 0 00 111 00 0 0
1 11 100 0 00 111 00 0 0
1 00 000 1 00 00 11 11 1
1 00 000 1 00 00 11 11 1
000H
010H
020H
000H
001H
* * * * 1 1 1 1 1 1 0 0 0 0 0 1 1 0 0 0 * * * * * * * * * * * * Write data (1), (2)
* * * * 0 0 0 0 0 1 1 1 0 0 0 0 1 1 1 1 * * * * * * * * * * * * Write data (3), (4)
* * * * 0 0 1 0 0 0 0 1 1 1 1 1 1 0 0 0 * * * * * * * * * * * * Write data (5), (6)
7F0H
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 28 Writing Operation of Write Mode 3
45