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HD6432351 Datasheet(PDF) 207 Page - Renesas Technology Corp

No. de pieza HD6432351
Descripción Electrónicos  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
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HD6432351 Datasheet(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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