MC68HC12 Datasheet, PDF (416/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

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BK0ALE — Breakpoint 0 Range Control
Valid in all modes.
0 = BRKAL will not be used to compare to the address bus.
1 = BRKAL will be used to compare to the address bus.
Table 20-8. Breakpoint Address Range Control
BK1ALE
–
–
0
1
BK0ALE
Address Range Selected
0 Upper 8-bit address only for full mode or dual mode BKP0
1 Full 16-bit address for full mode or dual mode BKP0
– Upper 8-bit address only for dual mode BKP1
– Full 16-bit address for dual mode BKP1
BRKCT1 — Breakpoint Control Register 1
RESET:
Bit 7
0
0
6
BKDBE
0
5
BKMBH
0
4
BKMBL
0
3
BK1RWE
0
2
BK1RW
0
1
BK0RWE
0
Bit 0
BK0RW
0
$0021
This register is read/write in all modes.
BKDBE — Enable Data Bus
Enables comparing of address or data bus values using the BRKDH/L
registers.
0 = The BRKDH/L registers are not used in any comparison
1 = The BRKDH/L registers are used to compare address or data
(depending upon the mode selections BKEN1,0)
BKMBH — Breakpoint Mask High
Disables the comparing of the high byte of data when in full breakpoint
mode. Used in conjunction with the BKDBE bit (which should be set)
0 = High byte of data bus (bits 15:8) are compared to BRKDH
1 = High byte is not used to in comparisons
Technical Data
416
Development Support
MC68HC912DT128A — Rev 4.0
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