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參數(shù)資料
| 型號： | HD66760 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 104 X 80-dot Graphics LCD Controller/Driver for 256 Colors |
| 中文描述： | 104 × 80點圖形LCD控制器/驅(qū)動器的256色 |
| 文件頁數(shù)： | 57/105頁 |
| 文件大小： | 653K |
| 代理商： | HD66760 |
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HD66760
57
4. Write mode 4: AM = 1, LG2–0 = 110/111
This mode is used when a vertical comparison is performed between the write data and the set value of the
compare register (CP7–0) to write the data. When the result by the comparison in a byte unit satisfies the
condition, the write data sent from the microcomputer is written to the GRAM. In this operation, the swap
function (SWP) and write-data mask function (WM15–0) are also enabled. After writing, the address
counter (AC) automatically increments by 256, 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 GRAM.
WM15
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
WM0
DB15
DB0
1 0 0 1 1 0 0 1 0 1 0 1 0 0 1 1
0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0
0 1 0 1 0 0 1 1 1 0 0 0 0 1 1 0
CP7
01 0 10 0 1 1
CP0
C
C
C
R
R
R
(Unmatched)
(Unmatched) (Unmatched)
(Unmatched)
1 0 0 1 1 0 0 1 *
0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0
1 0 0 0 0 1 1 0
*
"0000"H
Write data (1)
GRAM
"0080"H
"0100"H
Write data (2)
Write data (3)
"4F00"H
"0000"H
"0001"H
* * * * * * *
* * * * * * *
1 0 0 1 1 0 0 1*
0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0
1 0 0 0 0 1 1 0
*
* * * * * * *
* * * * * * *
Compare register:
Operation Examples:
1) I/D = "1", AM = "1", LG2-0 = "111" (unmatched write), SWP = "0"
2) CP7–0 = "53H"
3) WM15–0 = "0000"H
4) AC = "000"H
Write-data mask:
Write data (1):
Write data (2):
Write data (3):
Compare operation
Compare
operation
Compare
operation
Conditional replacement
Conditional replacement
Conditional replacement
Notes: 1. The bits in the GRAM indicated by '*' are not changed.
2. After writing to address 4F00H, the AC jumps to 0001H.
Figure 37 Writing Operation of Write Mode 4
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