Refresh Control Register (Rcr) Bsc - Hitachi SH7032 Hardware Manual

A.2.46 Refresh Control Register (RCR)
• Start Address: H'5FFFFAC
• Bus Width: 8/16/32 (read), 16 (write)
Register Overview:
Bit:
Bit name:
Initial value:
R/W:
Bit:
Bit name:
Initial value:
R/W:
Table A.47 RCR Bit Functions
Bit Bit Name
7 Refresh control (RFSHE)
6 Refresh mode (RMODE)
5,4 Wait state insertion CBR
refresh 1,0 (RLW1, RLW0)
614
15 14
— —
0 0
— —
7 6
RFSHE RMODE RLW1
0 0
R/W R/W
Value
0
1
0
1
0
0
1
1
13 12 11
— — —
0 0
— — —
5 4
RLW0 —
0 0
R/W R/W —
Description
No refresh control
(RTCNT can be used as an interval timer)
Refresh control
CAS-before-RAS refresh performed
Self-refresh performed
0 1-cycle wait state inserted
1 2-cycle wait state inserted
0 3-cycle wait state inserted
1 4-cycle wait state inserted
10 9
— —
0 0 0
— —
3 2 1
— —
0 0 0
— —
BSC
8
—
0
—
0
—
0
—
(Initial value)
(Initial value)
(Initial value)