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7721 Datasheet(PDF) 395 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 395 Page - Renesas Technology Corp

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14-12
7721 Group User’s Manual
DRAM CONTROLLER
14.5 Precautions for DRAMC
14.5 Precautions for DRAMC
1. Set the refresh timer (address 6616) to any of 0116–FF16.
2. When a DRAM refresh request occurs during Hold state, a refresh cycle is activated regardless of the
bus state. It is because a bus request is always sampled during Hold state. Therefore, in order to use
the DRAMC together with the Hold function, an external circuit which is controlled depending on the
states of ST0 and ST1 is required.
3. DRAM refresh is not performed in Stop or Wait mode.



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