HD6432670 Hitachi, HD6432670 Datasheet - Page 195

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Bit
5
4
3
2
1
0
Bit Name
RLW1
RLW0
SLFRF
TPCS2
TPCS1
TPCS0
Initial Value
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Refresh Cycle Wait Control
These bits select the number of wait states to
be inserted in a DRAM interface CAS-before-
RAS refresh cycle/synchronous DRAM interface
auto-refresh cycle. This setting applies to all
areas designated as DRAM/continuous
synchronous DRAM space.
00: No wait state inserted
01: 1 wait state inserted
10: 2 wait states inserted
11: 3 wait states inserted
Self-Refresh Enable
If this bit is set to 1, DRAM/synchronous 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.
0: Self-refreshing is disabled
1: Self-refreshing is enabled
Self-Refresh Precharge Cycle Control
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 DRACCR.
000: [TPC set value] states
001: [TPC set value + 1] states
010: [TPC set value + 2] states
011: [TPC set value + 3] states
100: [TPC set value + 4] states
101: [TPC set value + 5] states
110: [TPC set value + 6] states
111: [TPC set value + 7] states
Rev. 2.0, 04/02, page 149 of 906