Freescale Semiconductor, Inc.
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Breakpoints
Table 19-11. Breakpoint Read/Write Control
BK1RWE BK1RW BK0RWE BK0RW
Read/Write Selected
–
–
–
0
1
1
–
–
–
X
0
1
0
1
1
–
–
–
X
0
1
–
–
–
R/W is don’t care for full mode or dual mode BKP0
R/W is write for full mode or dual mode BKP0
R/W is read for full mode or dual mode BKP0
R/W is don’t care for dual mode BKP1
R/W is write for dual mode BKP1
R/W is read for dual mode BKP1
Bit 7
6
14
0
5
13
0
4
12
0
3
11
0
2
10
0
1
9
0
Bit 0
Bit 8
0
Bit 15
0
RESET:
BRKAH — Breakpoint Address Register, High Byte
$0022
These bits are used to compare against the most significant byte of the
address bus.
Bit 7
Bit 7
0
6
6
0
5
5
0
4
4
0
3
3
0
2
2
0
1
1
0
Bit 0
Bit 0
0
RESET:
BRKAL — Breakpoint Address Register, Low Byte
$0023
These bits are used to compare against the least significant byte of the
address bus. These bits may be excluded from being used in the match
if BK0ALE = 0.
68HC(9)12D60 — Rev 4.0
MOTOROLA
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