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104
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.
On-chip memory and registers are accessed in a fixed number of states that does not depend on
WCRH/WCRL settings.
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
W51
W50
W41
W40
1
Initial value
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
6
5
4
3
2
1
0
W71
W70
W61
W60
Bit
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
Bit 6
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)
Summary of Contents for H8/3008
Page 1: ...Hitachi 16 Bit Microcomputer H8 3008 Hardware Manual ADE 602 221 Rev 1 0 9 14 00 Hitachi Ltd ...
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