CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION
User’s Manual U12688EJ4V0UM00
156
(2) Refresh wait control register (RWC)
This specifies insertion of wait states during the refresh cycle. The register can be read/written in 8- or 1-bit units.
0
SRW0
Address
FFFFF218H
After reset
00H
1
SRW1
2
SRW2
3
RCW0
4
RCW1
5
RCW2
6
RRW0
7
RRW1
RWC
Bit Position
Bit Name
Function
Refresh RAS Wait Control
Specifies the number of wait states inserted as hold time for the RASm signal’s high
level width during CBR refresh.
RRW1
RRW0
Number of Insertion Wait States
0
0
0
0
1
1
1
0
2
1
1
3
7, 6
RRW1,
RRW0
Refresh Cycle Wait Control
Specifies the number of wait states inserted as hold time for the RASm signal’s low level
width during CBR refresh.
RCW2
RCW1
RCW0
Number of Insertion Wait States
0
0
0
0
0
0
1
1
0
1
0
2
0
1
1
3
1
0
0
4
1
0
1
5
1
1
0
6
1
1
1
7
5 to 3
RCW2 to
RCW0
Self-refresh Release Wait Control
Specifies the number of wait states inserted as CBR self-refresh release time.
SRW2
SRW1
SRW0
Number of Insertion Wait States
0
0
0
0
0
0
1
1
0
1
0
2
0
1
1
3
1
0
0
4
1
0
1
5
1
1
0
6
1
1
1
7
2 to 0
SRW2 to
SRW0
Caution Write to the RWC register after reset, and then do not change the set value. Also, do not
access an external memory area other than the one for this initialization routine until the initial
setting of the RWC register is complete. However, it is possible to access an external memory
area whose initialization is complete.
Remark
m = 0 to 7
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