Rev. 2.00, 09/03, page 178 of 690
Bit
Bit
Name
Initial
Value
R/W
Description
5
4
3
CKS2
CKS1
CKS0
0
0
0
R/W
R/W
R/W
Clock Select
Select the clock input to count-up the refresh timer counter
(RTCNT).
000: Stop the counting-up
001: B
φ
/4
010: B
φ
/16
011: B
φ
/64
100: B
φ
/256
101: B
φ
/1024
110: B
φ
/2048
111: B
φ
/4096
2
1
0
RRC2
RRC1
RRC0
0
0
0
R/W
R/W
R/W
Refresh Count
Specify the number of continuous refresh cycles, when the
refresh request occurs after the coincidence of the values of
the refresh timer counter (RTCNT) and the refresh time
constant register (RTCOR). These bits can make the period
of occurrence of refresh long.
000: Once
001: Twice
010: 4 times
011: 6 times
100: 8 times
101: Setting prohibited.
110: Setting prohibited.
111: Setting prohibited.
Содержание SH7705
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