MC68HC908AP64_07 FREESCALE [Freescale Semiconductor, Inc], MC68HC908AP64_07 Datasheet - Page 296

• Manufacturer Part Number: MC68HC908AP64_07
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Break Module (BRK)
21.5.2 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.
21.5.3 SIM Break Status Register
The SIM 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.
SBSW — Break Wait Bit
SBSW can be read within the break interrupt routine. The user can modify the return address on the stack
by subtracting 1 from it. The following code is an example.
294
This status bit is set when a break interrupt causes an exit from wait mode or stop mode. Clear SBSW
by writing a logic 0 to it. Reset clears SBSW.
1 = Stop mode or wait mode was exited by break interrupt
0 = Stop mode or wait mode was not exited by break interrupt
Note: Writing a logic 0 clears SBSW.
Address:
Address:
Address:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
$FE0C
$FE0D
$FE00
Bit 15
Bit 7
Bit 7
Bit 7
Bit 7
Figure 21-6. SIM Break Status Register (SBSR)
R
0
0
Figure 21-4. Break Address Register High (BRKH)
Figure 21-5. Break Address Register Low (BRKL)
14
R
6
0
6
6
0
6
MC68HC908AP Family Data Sheet, Rev. 4
13
R
R
5
0
5
5
0
5
= Reserved
12
R
4
0
4
4
0
4
11
R
3
0
3
3
0
3
10
R
2
0
2
2
0
2
SBSW
Note
1
9
0
1
1
0
1
0
Freescale Semiconductor
Bit 0
Bit 8
Bit 0
Bit 0
Bit 0
R
0
0