HD6412350 Hitachi, HD6412350 Datasheet - Page 158

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

Bit 5—Refresh Mode (RMODE): When refresh control is performed (RFSHE = 1), this bit
selects whether normal refreshing (CAS-before-RAS refreshing for the DRAM interface) or self-
refreshing is performed.
Bit 5
RMODE
0
1
Bit 4—Compare Match Flag (CMF): Status flag that indicates a match between the values of
RTCNT and RTCOR.
When refresh control is performed (RFSHE = 1), 1 should be written to the CMF bit when writing
to DRAMCR.
Bit 4
CMF
0
1
Bit 3—Compare Match Interrupt Enable (CMIE): Enables or disables interrupt requests (CMI)
by the CMF flag when the CMF flag in DRAMCR is set to 1.
When refresh control is performed (RFSHE = 1), the CMIE bit is always cleared to 0.
Bit 3
CMIE
0
1
138
Description
DRAM interface
CAS-before-RAS refreshing used
Self-refreshing used
Description
[Clearing condition]
Cleared by reading the CMF flag when CMF = 1, then writing 0 to the CMF flag
[Setting condition]
Set when RTCNT = RTCOR
Description
Interrupt request (CMI) by CMF flag disabled
Interrupt request (CMI) by CMF flag enabled
(Initial value)
(Initial value)
(Initial value)