CM16022ASFAYA-03 Datasheet, PDF (15/26 Pages) List of Unclassifed Manufacturers – LCD MODULE SPECIFICATION

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10.3 Interfacing to the MPU
The IC can send data in either two 4-bit operations, thus allowing interfacing with 4-
or 8-bit MPUs.
• For 4-bit interface data, only four bus lines (DB4 to DB7) are used for
transfer. Bus lines DB0 to DB3 are disabled. The data transfer between
the IC and the MPU is completed after the 4-bit data has been transferred
twice. As for the order of data transfer, the four high order bits (for 8-bit
operation,DB4 to DB7) are transferred before the four low order bits (for
8-bit operation, DB0 to DB3).
The busy flag must be checked (one instruction) after the 4-bit data has
been transferred twice. Two more 4-bit operations then transfer the busy
flag and address counter data.
RS
R/W
E
DB7
IR7 IR3
BF
AC3
DR7
DR3
DB6
IR6 IR2
AC6
AC2
DR6
DR2
DB5
IR5 IR1
AC5
AC1
DR5
DR1
DB4
IR4 IR0
AC4
AC0
Instruction register (IR)
write
Busy flag (BF) and
Address counter (AC)
read
4-Bit Transfer Example
DR4
DR0
Data register (DR)
read
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