External Memory Timing Register - Samsung S3C80A5B User Manual

CONTROL REGISTERS
EMT

— External Memory Timing Register

Bit Identifier
RESET Value
Read/Write
Addressing Mode
.7
.6
.5–.4
.3–.2
.1
.0
NOTE: The EMT register is not used for S3C80A5B, because an external peripheral interface is not implemented in the
S3C80A5B.
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 Input Function Enable Bit
0 Disable WAIT input function for external device
1 Enable WAIT input function for external device
Slow Memory Timing Enable Bit
0 Disable WAIT input function for external device
1 Enable WAIT input function for external device
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 S3C80A5B.
(note )
.5 .4
1 1
R/W R/W R/W
FEH
.3 .2 .1
1 1 0
R/W R/W
S3C80A5B
Set 1
.0
–
–