SH7014 Datasheet, PDF (154/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

8. Bus State Controller (BSC)
Bit 1⎯Refresh Control (RFSH): Selects whether to use refresh control for DRAM.
Bit 1
RFSH
0
1
Description
Do not refresh DRAM
Refresh DRAM
(initial value)
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
0
1
Description
CAS-before-RAS refresh
Self-refresh
(initial value)
Rev.5.00 Sep. 27, 2007 Page 120 of 716
REJ09B0398-0500