Freescale Semiconductor, Inc.
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Breakpoints
Table 18-10. Breakpoint Address Range Control
BK1ALE BK0ALE
Address Range Selected
Upper 8-bit address only for full mode or dual mode BKP0
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
–
–
0
1
0
1
–
–
Bit 7
6
BKDBE
0
5
BKMBH
0
4
BKMBL
0
3
BK1RWE
0
2
BK1RW
0
1
BK0RWE
0
Bit 0
BK0RW
0
0
0
RESET:
BRKCT1 — Breakpoint Control Register 1
$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 in comparisons
BKMBL — Breakpoint Mask Low
Disables the matching of the low byte of data when in full breakpoint
mode. Used in conjunction with the BKDBE bit (which should be set)
0 = Low byte of data bus (bits 7:0) are compared to BRKDL
1 = Low byte is not used in comparisons.
MC68HC912DG128 — Rev 3.0
Technical Data
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