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)： 60/105頁
文件大?。?/td> 653K
代理商： HD66760
HD66760
60
7. Read/Write mode 3: AM = 0, LG2–0 = 100/101
This mode is used when the data is horizontally written by comparing the original data and the set value of
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 comparison 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 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 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 or right edges of the GRAM.
WM15
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
WM0
DB15
1 0 0 1 1 0 0 1 0 1 0 1 0 0 1 1
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
"0000"H
"0001"H
"0002"H
GRAM
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
1 0 0 1 1 00 1 0 1 1 0 0 0 0 1
1 1 1 1 0 1 0 0 1 0 0 0 0 1 1 0
Compare
operation
Compare
operation
Compare
operation
Matched
replacement of
write data (1)
CP7
0 1 0 1 0 0 1 1
CP0
Compare register:
Conditional replacement
Conditional replacement
Conditional replacement
C
C
C
R
R
R
0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0
(Matched)
(Matched)
1 00 1 1 00 1 0 1 1 0 0 0 0 1
0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0
1 1 1 1 0 1 0 0 1 0 0 0 0 1 1 0
Matched
replacement of
write data (3)
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 = "0", LG2-0 = "100" (matched write), SWP = "0"
2) CP7–0 = "53H"
3) WM15–0 = "0000"H
4) AC = "000"H
Write-data mask:
Figure 40 Writing Operation of Read/Write Mode 3
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