Emt External Memory Timing Register - Samsung S3P80C5 User Manual

CONTROL REGISTERS
EMT
— External Memory Timing Register
Bit Identifier
RESET Value RESET
Read/Write
Addressing Mode
.7
.6
.5–.4
.3–.2
.1
.0
NOTE: The EMT register is not used for S3P80C5/C80C5/C80C8, because an external peripheral interface is not
implemented in the S3P80C5/C80C5/C80C8.
The program initialization routine should clear the EMT register to '00H' following a reset. Modification of EMT
values during normal operation may cause a system malfunction.
4-8
.7 .6
0 1
R/W R/W
Register addressing mode only
External WAIT WAIT Input Function Enable Bit
Disable WAIT input function for external device
0
Enable WAIT input function for external device
1
Slow Memory Timing Enable Bit
Disable WAIT input function for external device
0
Enable WAIT input function for external device
1
Program Memory Automatic Wait Control Bits
0 0 No wait
0 1 Wait one cycle
1 0 Wait two cycles
1 1 Wait three cycles
Data Memory Automatic Wait Control Bits
0 0 No wait
0 1 Wait one cycle
1 0 Wait two cycles
1 1 Wait three cycles
Stack Area Selection Bit
0 Select internal register file area
1 Select external data memory area
Not used for S3P80C5/C80C5/C80C8.
(note)
.5 .4
1 1
R/W R/W R/W
S3P80C5/C80C5/C80C8
FEH
.3 .2 .1
1 1 0
R/W R/W
Set 1
.0
–
–