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SH7014 Datasheet(PDF) 154 Page - Renesas Technology Corp |
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SH7014 Datasheet(HTML) 154 Page - Renesas Technology Corp |
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154 / 754 page  8. Bus State Controller (BSC) Rev.5.00 Sep. 27, 2007 Page 120 of 716 REJ09B0398-0500 Bit 1 ⎯Refresh Control (RFSH): Selects whether to use refresh control for DRAM. Bit 1 RFSH Description 0 Do not refresh DRAM (initial value) 1 Refresh DRAM Bit 0 ⎯Refresh Mode (RMD): When the RFSH bit is 1, this bit selects normal refresh or self- refresh. When the RFSH bit is 1, self-refresh mode is entered immediately after the RMD bit is set to 1. When RMD is cleared to 0, a CAS-before-RAS refresh is performed at the interval set in the refresh time constant register (RTCNT). When set for self-refresh, the this LSI enters self-refresh mode immediately unless it is in the middle of a DRAM access. If it is, it enters self-refresh mode when the access ends. Refresh requests from the interval timer are ignored in self-refresh mode. Bit 0 RMD Description 0 CAS-before-RAS refresh (initial value) 1 Self-refresh |
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