HD6432633 Datasheet, PDF (240/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

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
0
1
Description
[Clearing]
When CMF=1, read the CMF flag, then clear the CMF flag to 0
[Setting]
CMF is set when RTCNT=RTCOR
(Initial value)
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
0
1
Description
Disables CMF flag interrupt requests (CMI)
Enables CMF flag interrupt requests (CMI)
(Initial value)
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
CKS2
0
1
Bit 1
CKS1
0
1
0
1
Bit 0
CKS0
0
1
0
1
0
1
0
1
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)
186