528
REFCR—Refresh Control Register
H'FED4
Bus Controller
Bit
Initial value
Read/Write
15
CMF
0
R/(W)
*
14
CMIE
0
R/W
13
RCW1
0
R/W
12
RCW0
0
R/W
11
—
0
R/W
10
RTCK2
0
R/W
9
RTCK1
0
R/W
8
RTCK0
0
R/W
Refresh Counter Clock Select
0
Count operation halted
1
0
1
Count on ø/2
Count on ø/8
Count on ø/32
Count on ø/128
Count on ø/512
0
1
0
1
0
0
1
Count on ø/2048
1
0
Count on ø/4096
1
CAS
-
RAS
Wait Control
0
Wait state not inserted between
CAS
and
RAS
in refresh cycle
1
0
1
0
1
1 wait state inserted between
CAS
and
RAS
in refresh cycle
2 wait states inserted between
CAS
and
RAS
in refresh cycle
3 wait states inserted between
CAS
and
RAS
in refresh cycle
Compare Match Interrupt Enable
0
Interrupt request by CMF flag disabled
1
Interrupt request by CMF flag enabled
Compare Match Flag
0
[Clearing conditions]
• When 0 is written to CMF after reading CMF = 1 while the RFSHE
bit is cleared to 0
• When CBR refreshing is executed while the RFSHE bit is set to 1
1
[Setting condition]
When RTCOR = RTCNT
Note:
*
Only 0 can be written, to clear the flag.
Summary of Contents for H8S/2670
Page 5: ......
Page 9: ......
Page 199: ...182 ...
Page 361: ...344 ...
Page 393: ...376 ...
Page 647: ...630 ...