115
Bit 10
RTCK2
Bit 9
RTCK1
Bit 8
RTCK0
Description
0
0
0
Count operation halted
(Initial value)
1
Count on ø/2
1
0
Count on ø/8
1
Count on ø/32
1
0
0
Count on ø/128
1
Count on ø/512
1
0
Count on ø/2048
1
Count on ø/4096
Bit 7—Refresh Control (RFSHE): Selects whether or not refresh control is performed. When
refresh control is not performed, the refresh timer can be used as an interval timer.
Bit 7
RFSHE
Description
0
Refresh control is not performed
1
Refresh control is performed
(Initial value)
Bit 6—CBR Refresh Mode (CBRM): Allows selection of CBR refreshing performed in parallel
with other external accesses, or execution of CBR refreshing alone.
Bit 6
CBRM
Description
0
External access during CAS-before-RAS refreshing is enabled
(Initial value)
1
External access during CAS-before-RAS refreshing is disabled
Bits 5 and 4—Refresh Cycle Wait Control (RLW1, RLW0): These bits select the number of
wait states to be inserted in a DRAM interface CAS-before-RAS refresh cycle. This setting applies
to all areas designated as DRAM space.
Bit 5
RLW1
Bit 4
RLW0
Description
0
0
No wait state inserted in CBR refresh
(Initial value)
1
1 wait state inserted in CBR refresh
1
0
2 wait states inserted in CBR refresh
1
3 wait states inserted in CBR refresh
Summary of Contents for H8S/2670
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