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HD6432351 датащи(PDF) 173 Page - Renesas Technology Corp

номер детали HD6432351
подробное описание детали  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432351 датащи(HTML) 173 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 3.00 Sep 15, 2006 page 139 of 988
REJ09B0330-0300
Bit 6—RAS-CAS Wait (RCW): Controls wait state insertion in DRAM interface CAS-before-
RAS refreshing.
Bit 6
RCW
Description
0
Wait state insertion in CAS-before-RAS refreshing disabled
(Initial value)
RAS falls in TRr cycle
1
One wait state inserted in CAS-before-RAS refreshing
RAS falls in TRc1 cycle
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
Description
0
DRAM interface
CAS-before-RAS refreshing used
(Initial value)
1
Self-refreshing used
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
Description
0
[Clearing condition]
Cleared by reading the CMF flag when CMF = 1, then writing 0 to the CMF flag
(Initial value)
1
[Setting condition]
Set when RTCNT = RTCOR



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