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HD6432351 データシート(PDF) 207 Page - Renesas Technology Corp

部品番号 HD6432351
部品情報  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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メーカー  RENESAS [Renesas Technology Corp]
ホームページ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432351 データシート(HTML) 207 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 3.00 Sep 15, 2006 page 173 of 988
REJ09B0330-0300
thus repeated at fixed intervals determined by RTCOR and bits CKS2 to CKS0. Set a value in
RTCOR and bits CKS2 to CKS0 that will meet the refreshing interval specification for the DRAM
used.
When bits CKS2 to CKS0 are set, RTCNT starts counting up. RTCNT and RTCOR settings
should therefore be completed before setting bits CKS2 to CKS0.
Do not clear the CMF flag when refresh control is being performed (RFSHE = 1).
RTCNT operation is shown in figure 6.23, compare match timing in figure 6.24, and CBR refresh
timings in figure 6.25.
RTCOR
H'00
Refresh request
RTCNT
Figure 6.23 RTCNT Operation
RTCNT
φ
N
RTCOR
N
H'00
Refresh request signal
and CMF bit setting signal
Figure 6.24 Compare Match Timing



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