HD6417034 Datasheet, PDF (650/691 Pages) Renesas Technology Corp – SuperH RISC ENGINE SH7032 AND SH7034

A.2.46 Refresh Control Register (RCR)
BSC
• Start Address: H'5FFFFAC
• Bus Width: 8/16/32 (read), 16 (write)
Register Overview:
Bit: 15
14
13
12
11
10
9
8
Bit name: —
—
—
—
—
—
—
—
Initial value: 0
0
0
0
0
0
0
0
R/W: —
—
—
—
—
—
—
—
Bit: 7
6
5
4
3
2
1
0
Bit name: RFSHE RMODE RLW1 RLW0 —
—
—
—
Initial value: 0
0
0
0
0
0
0
0
R/W: R/W R/W R/W R/W
—
—
—
—
Table A.47 RCR Bit Functions
Bit Bit Name
Value Description
7
Refresh control (RFSHE) 0
No refresh control
(Initial value)
(RTCNT can be used as an interval timer)
1
Refresh control
6
Refresh mode (RMODE)
0
CAS-before-RAS refresh performed (Initial value)
1
Self-refresh performed
5,4 Wait state insertion CBR
0 0 1-cycle wait state inserted
refresh 1,0 (RLW1, RLW0) _{0 1 2-cycle wait state inserted}
(Initial value)
1 0 3-cycle wait state inserted
1 1 4-cycle wait state inserted
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