S6A0074 Datasheet, PDF (42/68 Pages) Samsung semiconductor – 34COM/80SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD

S6A0074
34COM/80SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD
INTERFACE WITH MPU IN BUS MODE
Interface with 8-bit MPU
If 8-bits MPU is used, S6A0074 can connect directly with that. In this case, port E, RS, R/W and DB0 to DB7
need to interface each other. Example of timing sequence is shown below.
RS
R/W
E
Internal Signal
DB7
Data
Internal Operation
Busy
Busy
No
Busy
Data
Instruction
Busy Flag
Check
Busy Flag
Check
Busy Flag
Check
Instruction
Figure 11. Example of 8-bit Bus Mode Timing Sequence
Interface with 4-bit MPU
If 4-bit MPU is used, S6A0074 can connect directly with this. In this case, port E, RS, R/W and DB4 - DB7 need
to interface each other. The transfer is performed by two times. Example of timing sequence is shown below.
RS
R/W
E
Internal Signal
DB7
D7 D3
Internal Operation
Busy AC3
No
Busy
AC3
D7 D3
Instruction
Busy Flag Check
Busy Flag Check
Fig 12. Example of 4-bit Bus Mode Timing Sequence
Instruction
42