Wait Control Registers H And L (Wcrh, Wcrl) - Hitachi H8S/2646 Hardware Manual

7.2.3

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 :
W71
Initial value :
R/W : 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 Bit 6
W71 W70
0 0
1
1 0
1
Bits 5 and 4—Area 6 Wait Control 1 and 0 (W61, W60): These bits select the number of
program wait states when area 6 in external space is accessed while the AST6 bit in ASTCR is set
to 1.
Bit 5 Bit 4
W61 W60
0 0
1
1 0
1
146
7 6 5
W70 W61
1 1 1
R/W R/W
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
Description
Program wait not inserted when external space area 6 is accessed
1 program wait state inserted when external space area 6 is accessed
2 program wait states inserted when external space area 6 is accessed
3 program wait states inserted when external space area 6 is accessed
4 3
W60 W51 W50
1 1
R/W R/W R/W
2 1 0
W41 W40
1 1 1
R/W R/W
(Initial value)
(Initial value)