HD6412350 Hitachi, HD6412350 Datasheet - Page 847

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

DRAMCR—DRAM Control Register
Bit
Initial value
Read/Write
:
:
:
Refresh Control
RFSHE
0
1
R/W
7
0
Refresh control is not performed
Refresh control is performed
RAS-CAS Wait
0
1
RCW
R/W
Wait state insertion in CAS-before-RAS refreshing disabled
RAS falls in T
One wait state inserted in CAS-before-RAS refreshing
RAS falls in T
6
0
Refresh Mode
0
1
RMODE
R/W
DRAM interface: CAS-before-RAS refreshing used
Self-refreshing used
5
0
Rr
Rc1
Compare Match Flag
cycle
0
1
cycle
[Clearing condition]
[Setting condition]
CMF
R/W
Set when RTCNT = RTCOR
Cleared by reading the CMF flag when CMF = 1, then
writing 0 to the CMF flag
4
0
Compare Match Interrupt Enable
0
1
H'FED7
CMIE
Interrupt request (CMI) by CMF flag disabled
Interrupt request (CMI) by CMF flag enabled
R/W
3
0
Refresh Counter Clock Select
0
1
CKS2
R/W
0
1
0
1
2
0
0
1
0
1
0
1
0
1
Count operation disabled
Count uses ø/2
Count uses ø/8
Count uses ø/32
Count uses ø/128
Count uses ø/512
Count uses ø/2048
Count uses ø/4096
CKS1
R/W
1
0
Bus Controller
CKS0
R/W
0
0
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