113
Bit 1
RCD1
Bit 0
RCD0
Description
0
0
Wait cycle not inserted between
RAS
assert cycle and
CAS
assert
cycle
(Initial value)
1
1-state wait cycle inserted between
RAS
assert cycle and
CAS
assert
cycle
1
0
2-state wait cycle inserted between
RAS
assert cycle and
CAS
assert
cycle
1
3-state wait cycle inserted between
RAS
assert cycle and
CAS
assert
cycle
4.2.10
Refresh Control Register (REFCR)
Bit
15
14
13
12
11
10
9
8
CMF
CMIE
RCW1
RCW0
—
RTCK2
RTCK1
RTCK0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
*
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit
7
6
5
4
3
2
1
0
RFSHE
CBRM
RLW1
RLW0
SLFRF
TPCS2
TPCS1
TPCS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Note:
*
Only 0 can be written, to clear the flag.
REFCR is a 16-bit readable/writable register that specifies DRAM interface refresh control.
REFCR is initialized to H'0000 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit 15—Compare match Flag (CMF): Status flag that indicates a match between the values of
the refresh counter (RTCNT) and the refresh time constant register (RTCOR).
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