參數(shù)資料
型號(hào)： HD66760
廠(chǎng)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(yè)數(shù)： 58/105頁(yè)
文件大小： 653K
代理商： HD66760
HD66760
58
5. Read/Write mode 1: AM = 0, LG2–0 = 001/010/011
This mode is used when the data is horizontally written at high speed by performing a logical operation
with the original data. It reads the display data (original data), which has already been written in the
GRAM, performs a logical operation with the write data sent from the microcomputer, and rewrites the
data to the GRAM. 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) or 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 0 0 0 1 1
DB0
Write data (1):
1 0 1 1 1 1 0 0 0 1 1 0 0 0 0 1
Write data (2):
1 1 0 0 0 0 1 1 1 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
"0000"H
"0001"H
"0002"H
Read data (1) + write data (1)
GRAM
Read data (1):
Read data (2):
0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0
Read data (3):
0 0 0 0 1 1 1 0 1 0 0 0 0 1 1 0
1 0 1 1 1 1 0 1 0 1 1 0 0 0 1 1
1 1 0 0 1 1 1 1 1 0 0 0 1 1 0 0
0 1 1 1 1 1 1 0 1 0 0 1 1 1 1 1
Logical operation
(OR)
Logical operation
(OR)
Logical operation
(OR)
0 1 1 1 1 1 1 0 1 0 0 1 1 1 1 1
1 1 0 0 1 1 1 1 1 0 0 0 1 1 0 0
1 0 1 1 1 1 0 1 0 1 1 0 0 0 1 1
Read data (2) + write data (2)
Read data (3) + write data (3)
Operation Examples:
1) I/D = "1", AM = "0", LG2-0 = "001" (OR), SWP = "0"
2) WM15–0 = "0000"H
3) AC = "000"H
Write-data mask:
Figure 38 Writing Operation of Read/Write Mode 1
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