MC68HC912BL16 Datasheet, PDF (124/128 Pages) Freescale Semiconductor, Inc – 16-Bit Microcontroller

Freescale Semiconductor, Inc.
BRKCT0 — Breakpoint Control Register 0
Bit 7
6
5
4
3
2
1
BKEN1 BKEN0 BKPM
0
BK1ALE BK0ALE
0
RESET:
0
0
0
0
0
0
0
$0020
Bit 0
0
0
Read and write anytime.
This register is used to control the breakpoint logic.
BKEN1, BKEN0 — Breakpoint Mode Enable
Table 43 Breakpoint Mode Control
BKEN1 BKEN0
Mode Selected
0
0 Breakpoints Off
0
1 SWI — Dual Address Mode
1
0 BDM — Full Breakpoint Mode
1
1 BDM — Dual Address Mode
BRKAH/L Usage BRKDH/L Usage R/W
—
—
—
Address Match Address Match No
Address Match
Data Match
Yes
Address Match Address Match Yes
Range
—
Yes
Yes
Yes
BKPM — Break on Program Addresses
This bit controls whether the breakpoint will cause an immediate data breakpoint (next instruction
boundary) or a delayed program breakpoint related to an executable opcode. Data and unexecuted op-
codes cannot cause a break if this bit is set. This bit has no meaning in SWI dual address mode. The
SWI mode only performs program breakpoints.
0 = On match, break at the next instruction boundary
1 = On match, break if the match is an instruction that will be executed. This uses tagging as its
breakpoint mechanism.
BK1ALE — Breakpoint 1 Range Control
Only valid in dual address mode.
0 = BRKDL will not be used to compare to the address bus.
1 = BRKDL will be used to compare to the address bus.
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 44 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
Bit 7
6
5
4
3
2
1
Bit 0
0
BKDBE BKMBH BKMBL BK1RWE BK1RW BK0RWE BK0RW
RESET:
0
0
0
0
0
0
0
0
This register is read/write in all modes.
$0021
MC68HC912BL16
124
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