Datasheet

Section 7 Bus Controller
Page 192 of 1434 R01UH0166EJ0600 Rev. 6.00
Mar 02, 2011
H8S/2633 Group, H8S/2633 F-ZTAT
TM
,
H8S/2633R F-ZTAT
TM
, H8S/2695
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 (Initial value)
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) (Initial value)
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 (
φ) 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 Description
0 0 0 Stops count (Initial value)
1 Counts on φ/2
1 0 Counts on φ/8
1 Counts on φ/32
1 0 0 Counts on φ/128
1 Counts on φ/512
1 0 Counts on φ/2048
1 Counts on φ/4096