D12320VF25V Datasheet, PDF (179/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 6 Bus Controller
6.2.3 Wait Control Registers H and L (WCRH, WCRL)
WCRH and WCRL are 8-bit readable/writable registers that select the number of program wait
states for each area.
Program waits are not inserted in the case of on-chip memory or internal I/O registers.
WCRH and WCRL are initialized to H'FF by a reset and in hardware standby mode. They are not
initialized in software standby mode.
WCRH
Bit
:
Initial value :
R/W
:
7
W71
1
R/W
6
W70
1
R/W
5
W61
1
R/W
4
W60
1
R/W
3
W51
1
R/W
2
W50
1
R/W
1
W41
1
R/W
0
W40
1
R/W
Bits 7 and 6—Area 7 Wait Control 1 and 0 (W71, W70): These bits select the number of
program wait states when area 7 in external space is accessed while the AST7 bit in ASTCR is set
to 1.
Bit 7
W71
0
1
Bit 6
W70
0
1
0
1
Description
Program wait not inserted when external space area 7 is accessed
1 program wait state inserted when external space area 7 is accessed
2 program wait states inserted when external space area 7 is accessed
3 program wait states inserted when external space area 7 is accessed
(Initial value)
Rev.7.00 Feb. 14, 2007 page 145 of 1108
REJ09B0089-0700