Datasheet

Development Support
Technical Data MC68HC912DT128A — Rev 4.0
418 Development Support MOTOROLA
These bits are used to compare against the most significant byte of the
address bus.
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.
These bits are compared to the most significant byte of the data bus or
the most significant byte of the address bus in dual address modes.
BKEN[1:0], BKDBE, and BKMBH control how this byte will be used in the
breakpoint comparison.
Table 20-9. Breakpoint Read/Write Control
BK1RWE BK1RW BK0RWE BK0RW Read/Write Selected
––0X
R/W
is don’t care for full mode or dual mode
BKP0
––10R/W
is write for full mode or dual mode BKP0
––11R/W
is read for full mode or dual mode BKP0
0X––R/W
is don’t care for dual mode BKP1
10––R/W
is write for dual mode BKP1
11––R/W
is read for dual mode BKP1
BRKAH — Breakpoint Address Register, High Byte $0022
Bit 7 6 5 4 3 2 1 Bit 0
Bit 15 14 13 12 11 10 9 Bit 8
RESET: 0 0 0 0 0 0 0 0
BRKAL — Breakpoint Address Register, Low Byte $0023
Bit 7 6 5 4 3 2 1 Bit 0
Bit 7 6 5 4 3 2 1 Bit 0
RESET: 0 0 0 0 0 0 0 0
BRKDH — Breakpoint Data Register, High Byte $0024
Bit 7 6 5 4 3 2 1 Bit 0
Bit 15 14 13 12 11 10 9 Bit 8
RESET: 0 0 0 0 0 0 0 0
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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