Datasheet

Development Support
Breakpoints
MC68HC912D60A — Rev. 3.1 Technical Data
Freescale Semiconductor Development Support 399
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.
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 in comparisons
Table 19-10. Breakpoint Address Range Control
BK1ALE 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
0 – Upper 8-bit address only for dual mode BKP1
1 – Full 16-bit address for dual mode BKP1
Bit 7654321Bit 0
0 BKDBE BKMBH BKMBL BK1RWE BK1RW BK0RWE BK0RW
RESET: 00000000
BRKCT1 — Breakpoint Control Register 1 $0021