XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 330

• Manufacturer Part Number: XC912BC32CFU8
• Description: M68HC12B Family Data Sheet
• Manufacturer: Motorola Semiconductor Products

Development Support
18.4.2.2 Breakpoint Control Register 1
Data Sheet
330
BK1ALE — Breakpoint 1 Range Control Bit
BK0ALE — Breakpoint 0 Range Control Bit
This register is read/write in all modes.
BKDBE — Enable Data Bus Bit
BKMBH — Breakpoint Mask High Bit
BK1ALE
bit is set. This bit has no meaning in SWI dual address mode. The SWI mode
only performs program breakpoints.
Only valid in dual address mode
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)
Address: $0021
—
—
Reset:
0
1
Read:
Write:
0 = On match, break at the next instruction boundary
1 = On match, break if the match is an instruction to be executed. This uses
0 = BRKDL is not used to compare to the address bus.
1 = BRKDL is used to compare to the address bus.
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
0 = High byte of data bus (bits 15:8) are compared to BRKDH.
1 = High byte is not used in comparisons.
tagging as its breakpoint mechanism.
upon the mode selections BKEN1 and BKEN0).
Figure 18-11. Breakpoint Control Register 1 (BRKCT1)
Bit 7
BK0ALE
0
0
—
—
Table 18-8. Breakpoint Address Range Control
0
1
BKDBE
Development Support
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
BKMBH
5
0
BKMBL
4
0
Address Range Selected
BK1RWE
3
0
BK1RW
M68HC12B Family — Rev. 8.0
2
0
BK0RWE
1
0
MOTOROLA
BK0RW
Bit 0
0