參數(shù)資料
型號(hào)： 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(diǎn)圖形LCD控制器/驅(qū)動(dòng)器的256色
文件頁數(shù)： 61/105頁
文件大?。?/td> 653K
代理商： HD66760
HD66760
61
8. Read/Write mode 4: AM = 1, LG2–0 = 100/101
This mode is used when the data is vertically written by comparing the original data and the set value of
the compare register (CP7–0). It reads the display data (original data), which has already been written in
the GRAM, compares the original data and the set value of the compare register in byte units, and writes
the data sent from the microcomputer to the GRAM only when the result of the compare operation
satisfies the condition. This mode reads the data during the same access-pulse width (68-system: enabled
high level, 80-system: RD* low level) as the write operation since reading the original data does not latch
the read data into the microcomputer but temporarily holds it in the read-data latch. However, the bus
cycle requires the same time as the read operation. 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 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.
Notes: 1. The bits in the GRAM indicated by '*' are not changed.
2. After writing to address 4F00H, the AC jumps to 0001H.
WM15
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
WM0
DB15
DB0
1 0 1 1 1 1 0 0 0 1 1 0 0 0 0 1
1 1 0 0 0 0 1 1 1 0 0 0 1 1 0 0
1 1 1 1 0 1 0 0 0 0 0 1 1 1 1 1
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
0 1 0 1 0 0 1 1
CP0
C
C
C
R
R
R
(Unmatched)
(Unmatched)
(Unmatched)
(Unmatched)
1 0 1 1 1 1 0 0 0 1 0 1 0 0 1 1
1 1 0 0 0 0 1 1 1 0 0 0 1 1 0 0
0 0 0 1 1 1 1 1
0 1 0 1 0 0 1 1
"0000"H
Write data (1)
GRAM
"0080"H
"0100"H
Write data (2)
Write data (3)
"4F00"H
"0000"H
"0001"H
1 0 1 1 1 1 0 0 0 1 0 1 0 0 1 1
1 1 0 0 0 0 1 1 1 0 0 0 1 1 0 0
0 0 0 1 1 1 1 1
0 1 0 1 0 0 1 1
Compare
operation
Compare
operation
Compare
operation
Compare register:
Conditional replacement
Conditional replacement
Conditional replacement
Write data (1):
Write data (2):
Write data (3):
Read data (1):
Read data (2):
Read data (3):
Operation Examples:
1) I/D = "1", AM = "1", LG2-0 = "101" (unmatched write), SWP = "0"
2) CP7–0 = "53H"
3) WM15–0 = "0000"H
4) AC = "000"H
Write-data mask:
Figure 41 Writing Operation of Read/Write Mode 4
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