Bit 7—Compare-Match Flag (CMF): Status flag that indicates a match between the refresh
timer counter (RTCNT) and refresh time constant register (RTCOR) values.
Bit 7: CMF
Description
0
RTCNT and RTCOR values do not match
(Initial value)
[Clearing condition]
When 0 is written to CMF
1
RTCNT and RTCOR values match
[Setting condition]
When RTCNT = RTCOR*
Note: * If 1 is written, the original value is retained.
Bit 6—Compare-Match Interrupt Enable (CMIE): Controls generation or suppression of an
interrupt request when the CMF flag is set to 1 in RTCSR. Do not set this bit to 1 when CAS-
before-RAS refreshing or auto-refreshing is used.
Bit 6: CMIE
Description
0
1
Interrupt requests initiated by CMF are disabled
Interrupt requests initiated by CMF are enabled
(Initial value)
Bits 5 to 3—Clock Select Bits (CKS2–CKS0): These bits select the input clock for RTCNT. The
base clock is the external bus clock (CKIO). The RTCNT count clock is obtained by scaling CKIO
by the specified factor.
Bit 5: CKS2
Bit 4: CKS1
Bit 3: CKS0
Description
Clock input disabled
Bus clock (CKIO)/4
CKIO/16
0
0
0
1
0
1
0
1
0
1
(Initial value)
1
0
1
CKIO/64
1
CKIO/256
CKIO/1024
CKIO/2048
CKIO/4096
Rev. 6.0, 07/02, page 365 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
