HD66712 Datasheet, PDF (52/88 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver

HD66712U
Interface with 4-Bit MPUs: The HD66712 can interface with a 4-bit MCU through an I/O port. 4-bit
data representing high and low order bits must be transferred sequentially.
The DL bit in function-set selects 4-bit or 8-bit interface data length.
RS
R/W
E
Internal
signal
DB7
IR7 IR3
Instruction
write
Internal operation
Busy AC3
Busy flag check
Not
Busy ^AC3
Busy flag check
D7 D3
Instruction
write
Figure 20 Example of 4-Bit Data Transfer Timing Sequence
HMCS4019R
D15
D14
D13
4
R10–R13
HD66712
RS
R/W
E
DB4–DB7
Figure 21 4-bit MPU Interface
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