HD6432646 Hitachi, HD6432646 Datasheet - Page 180
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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7.2.3
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
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
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
W61
0
1
146
Bit
Initial value
R/W
Wait Control Registers H and L (WCRH, WCRL)
Bit 6
W70
0
1
0
1
Bit 4
W60
0
1
0
1
:
:
:
W71
R/W
7
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
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
W70
R/W
6
1
W61
R/W
5
1
W60
R/W
4
1
W51
R/W
3
1
W50
R/W
2
1
W41
R/W
1
1
(Initial value)
(Initial value)
W40
R/W
0
1
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