HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 279
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HD6412373R
Manufacturer Part Number
HD6412373R
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412373R.pdf
(1208 pages)
- Current page: 279 of 1208
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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 SLFRF bit to 1 in REFCR. 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 6.39.
When software standby mode is exited, the SLFRF bit is cleared to 0 and self-refresh mode is
exited automatically. If a CBR refresh request occurs when making a transition to software
standby mode, CBR refreshing is executed, then self-refresh mode is entered.
When using self-refresh mode, the OPE bit must not be cleared to 0 in the SBYCR register.
φ
A23 to A0
CS
AS
RD
HWR (WE)
RAS
CAS
Figure 6.38 Example of CBR Refresh Timing (CBRM = 1)
Normal space access request
Refresh period
Rev.7.00 Mar. 18, 2009 page 211 of 1136
Section 6 Bus Controller (BSC)
REJ09B0109-0700
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