mc68hc908kx8 Freescale Semiconductor, Inc, mc68hc908kx8 Datasheet - Page 172

• Manufacturer Part Number: mc68hc908kx8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Development Support
16.2.2.2 Break Address Registers
The break address registers (BRKH and BRKL) contain the high and low bytes of the desired breakpoint
address. Reset clears the break address registers.
16.2.2.3 Break Status Register
The break status register (SBSR) contains a flag to indicate that a break caused an exit from wait mode.
The flag is useful in applications requiring a return to wait mode after exiting from a break interrupt.
BW — Break Wait Bit
BW can be read within the break interrupt routine. The user can modify the return address on the stack
by subtracting 1 from it.
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This read/write bit is set when a break interrupt causes an exit from wait mode. Clear BW by writing
a 0 to it. Reset clears BW.
1 = Break interrupt during wait mode
0 = No break interrupt during wait mode
Note: Writing a 0 clears BW.
Address:
Address:
Address:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
$FE0A
$FE09
$FE00
Bit 15
Bit 7
Bit 7
Bit 7
Bit 7
R
0
0
0
0
Figure 16-4. Break Address Register High (BRKH)
Figure 16-5. Break Address Register Low (BRKL)
Figure 16-6. SIM Break Status Register (SBSR)
14
R
6
0
6
6
0
6
0
0
13
R
5
0
5
5
0
5
0
0
12
R
R
4
0
4
4
0
4
1
1
= Reserved
11
R
3
0
3
3
0
3
0
0
10
R
2
0
2
2
0
2
0
0
NOTE
BW
1
9
0
1
1
0
1
0
Freescale Semiconductor
Bit 0
Bit 8
Bit 0
Bit 0
Bit 0
R
0
0
0
0