mc68hc912bc32 Freescale Semiconductor, Inc, mc68hc912bc32 Datasheet - Page 302

• Manufacturer Part Number: mc68hc912bc32
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Development Support
BK0ALE — Breakpoint 0 Range Control Bit
18.4.2.2 Breakpoint Control Register 1
This register is read/write in all modes.
BKDBE — Enable Data Bus Bit
BKMBH — Breakpoint Mask High Bit
BKMBL — Breakpoint Mask Low Bit
BK1RWE — R/W Compare Enable Bit
302
Valid in all modes
Enables comparing of address or data bus values using the BRKDH/L registers.
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)
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)
Enables the comparison of the R/W signal to further specify what causes a match. This bit is NOT
useful in program breakpoints or in full breakpoint mode. This bit is used in conjunction with a second
address in dual address mode when BKDBE = 1.
0 = BRKAL is not used to compare to the address bus.
1 = BRKAL is used to compare to the address bus.
0 = BRKDH/L registers are not used in any comparison.
1 = BRKDH/L registers are used to compare address or data (depending upon the mode selections
0 = High byte of data bus (bits 15:8) are compared to BRKDH.
1 = High byte is not used in comparisons.
0 = Low byte of data bus (bits 7–0) are compared to BRKDL.
1 = Low byte is not used to in comparisons.
0 = R/W is not used in comparisons.
1 = R/W is used in comparisons.
BKEN1 and BKEN0).
BK1ALE
Address: $0021
—
—
Reset:
Read:
0
1
Write:
Figure 18-11. Breakpoint Control Register 1 (BRKCT1)
Bit 7
BK0ALE
0
0
—
—
Table 18-8. Breakpoint Address Range Control
0
1
BKDBE
6
0
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
M68HC12B Family Data Sheet, Rev. 9.1
BKMBH
5
0
BKMBL
4
0
Address Range Selected
BK1RWE
3
0
BK1RW
2
0
BK0RWE
1
0
Freescale Semiconductor
BK0RW
Bit 0
0