116
Bit 3—Self-Refresh Enable (SLFRF): If this bit is set to 1, DRAM self-refresh mode is selected
when a transition is made to the software standby state.
This bit is valid when the RFSHE bit is set to 1, enabling refresh operations. It is cleared after
recovery from software standby mode.
Bit 3
SLFRF
Description
0
Self-refreshing is disabled in software standby mode
(Initial value)
1
Self-refreshing is enabled in software standby mode
Bits 2 to 0—Self-Refresh Precharge Cycle Control (TPCS2 to TPCS0): These bits select the
number of states in the precharge cycle immediately after self-refreshing.
The number of states in the precharge cycle immediately after self-refreshing are added to the
number of states set by bits TPC1 and TPC0 in the DRACCR register.
Bit 2
TPCS2
Bit 1
TPCS1
Bit 0
TPCS0
Description
0
0
0
RAS
precharge cycle after self-refresh =
[TPC set value] states
(Initial value)
1
RAS
precharge cycle after self-refresh =
[TPC set value + 1] states
1
0
RAS
precharge cycle after self-refresh =
[TPC set value + 2] states
1
RAS
precharge cycle after self-refresh =
[TPC set value + 3] states
1
0
0
RAS
precharge cycle after self-refresh =
[TPC set value + 4] states
1
RAS
precharge cycle after self-refresh =
[TPC set value + 5] states
1
0
RAS
precharge cycle after self-refresh =
[TPC set value + 6] states
1
RAS
precharge cycle after self-refresh =
[TPC set value + 7] states
Содержание H8S/2670
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