參數(shù)資料
型號(hào): HD66732
廠商: Hitachi,Ltd.
英文描述: Graphics Liquid Crystal Display Controller/Driver Supporting JIS Level-1 and Level-2 Kanji ROM(圖形LCD控制器/驅(qū)動(dòng)器)
中文描述: 圖形液晶顯示控制器/驅(qū)動(dòng)器支持日標(biāo)級(jí)- 1和第2級(jí)漢字光盤(pán)(圖形液晶顯示控制器/驅(qū)動(dòng)器)
文件頁(yè)數(shù): 71/133頁(yè)
文件大?。?/td> 2608K
代理商: HD66732
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HD66732
71
Parallel Data Transfer
8-bit Interface
Setting the IM2/1/0 (interface mode) to the GND/Vcc/GND level allows E-clock-synchronized 8-bit
parallel data transfer. Setting the IM2/1/0 (interface mode) to the Vcc/Vcc/GND level allows 80-system 8-
bit parallel data transfer. When the number of buses or the mounting area is limited, use a 4-bit bus
interface or serial data transfer.
Using a parallel bus interface disables the key scan function. To prevent this, use a clock-synchronized
serial interface.
C0
C1
C2
A0–A7
E/WR*
RS
R/W / RD*
(CS*)
DB0–DB7
H8/325
HD66732
8
*Interface via I/O port
Figure 31 Interface to 8-bit Microcomputer
4-bit Interface
Setting the IM2/1/0 (interface mode) to the GND/Vcc/Vcc level allows E-clock-synchronized 4-bit parallel
data transfer using pins DB7/KIN7-DB4/KIN4. Setting the IM2/1/0 (interface mode) to the Vcc/Vcc/Vcc
level allows 80-system 4-bit parallel data transfer. 8-bit instructions and RAM data are divided into four
upper/lower bits and the transfer starts from the upper four bits.
Using a parallel bus interface disables the key scan function. To prevent this, use a clock-synchronized
serial interface.
Note:
Transfer synchronization function for a 4-bit bus interface
The HD66732 supports the transfer synchronization function which resets the upper/lower counter
to count upper/lower 4-bit data transfer in the 4-bit bus interface. Noise causing transfer mismatch
between the four upper and lower bits can be corrected by a reset triggered by consecutively
writing a 0000 instruction four times. The next transfer starts from the upper four bits. Executing
synchronization function periodically can recover any runaway in the display system.
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