Renesas H8S/2633 Series Hardware Manual page 240

Bit 4—Compare Match Flag (CMF): This status flag shows a match between RTCNT and
RTCOR values.
When performing refresh control (RFSHE=1), write 1 to CMF when writing to the DRAMCR.
Bit 4
CMF Description
0 [Clearing]
When CMF=1, read the CMF flag, then clear the CMF flag to 0
1 [Setting]
CMF is set when RTCNT=RTCOR
Bit 3—Compare Match Interrupt Enable (CMIE): This bit enables/disables the CMF flag
interrupt request (CMI) when the DRAMCR CMF flag is set to 1.
CMIE is always 0 when performing refresh control (RFSHE = 1).
Bit 3
CMIE Description
0 Disables CMF flag interrupt requests (CMI)
1 Enables CMF flag interrupt requests (CMI)
Bits 2 to 0—Refresh Counter Clock Select (CKS2 to CKS0): These bits select from the seven
internal clocks derived by dividing the system clock (ø) to be input to RTCNT. The RTCNT count
up starts when CKS2 to CKS0 are set to select the input clock.
Bit 2 Bit 1 Bit 0
CKS2 CKS1 CKS0
0 0 0
1
1 0
1
1 0 0
1
1 0
1
186
Description
Stops count
Counts on ø/2
Counts on ø/8
Counts on ø/32
Counts on ø/128
Counts on ø/512
Counts on ø/2048
Counts on ø/4096
(Initial value)
(Initial value)
(Initial value)