HD6417751RBP240V Datasheet, PDF (489/1226 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

13. Bus State Controller (BSC)
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
[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.
(Initial value)
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
0
1
Description
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
0
1
Bit 4: CKS1
0
1
0
1
Bit 3: CKS0
0
1
0
1
0
1
0
1
Description
Clock input disabled
Bus clock (CKIO)/4
CKIO/16
CKIO/64
CKIO/256
CKIO/1024
CKIO/2048
CKIO/4096
(Initial value)
Rev.4.00 Oct. 10, 2008 Page 389 of 1122
REJ09B0370-0400