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HD6432351 bảng dữ liệu(PDF) 209 Page - Renesas Technology Corp

tên linh kiện HD6432351
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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HD6432351 bảng dữ liệu(HTML) 209 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 3.00 Sep 15, 2006 page 175 of 988
REJ09B0330-0300
(2) Self-Refreshing
A self-refresh mode (battery backup mode) is provided for DRAM as a kind of standby mode. In
this mode, refresh timing and refresh addresses are generated within the DRAM.
To select self-refreshing, set the RFSHE bit and RMODE bit in DRAMCR to 1. Then, when a
SLEEP instruction is executed to enter software standby mode, the
CAS and RAS signals are
output and DRAM enters self-refresh mode, as shown in figure 6.27.
When software standby mode is exited, the RMODE bit is cleared to 0 and self-refresh mode is
cleared.
When switching to software standby mode, if there is a CBR refresh request, CBR refreshing is
executed before self-refresh mode is entered.
TRp
φ
CSn (RAS)
TRcr
CAS, LCAS
HWR (WE)
TRc3
Software
standby
Note: n = 2 to 5
High
Figure 6.27 Self-Refresh Timing (When CW2 = 1, or CW2 = 0 and LCASS = 0)



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