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H83069RF Datasheet(PDF) 187 Page - Renesas Technology Corp

Part # H83069RF
Description  Renesas 16-Bit Single-Chip Microcomputer
PDF  1003 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H83069RF Datasheet(HTML) 187 Page - Renesas Technology Corp

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Rev. 5.0, 09/04, page 165 of 978
A23 to A0
φ
CSn (RAS)
Tp
Tr
Tc2
(
UCAS/LCAS)
PB4/PB5
D15 to D0
T2
Tc1
T1
Tc2
Tc1
AS
Note: n = 2 to 5
DRAM access
DRAM access
External space
access
Figure 6.23 Example of Operation Timing in RAS Down Mode (CSEL = 0)
When RAS down mode is selected, the conditions for an asserted
RASn signal to return to the
high level are as shown below. The timing in these cases is shown in figure 6.24.
 When DRAM space with a different row address is accessed
 Immediately before a CAS-before-RAS refresh cycle
 When the BE bit or RDM bit is cleared to 0 in DRCRA
 Immediately before release of the external bus



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