146
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
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
0
W40
1
R/W
2
W50
1
R/W
1
W41
1
R/W
Bit
Initial value
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
Description
0
0
Program wait not inserted when external space area 7 is accessed
1
1 program wait state inserted when external space area 7 is accessed
1
0
2 program wait states inserted when external space area 7 is accessed
1
3 program wait states inserted when external space area 7 is accessed
(Initial value)
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
Description
0
0
Program wait not inserted when external space area 6 is accessed
1
1 program wait state inserted when external space area 6 is accessed
1
0
2 program wait states inserted when external space area 6 is accessed
1
3 program wait states inserted when external space area 6 is accessed
(Initial value)
Summary of Contents for H8S/2645
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Page 837: ...805 A 2 Instruction Codes Table A 2 shows the instruction codes ...
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