mc68hc908as60 Freescale Semiconductor, Inc, mc68hc908as60 Datasheet - Page 151

• Manufacturer Part Number: mc68hc908as60
• Description: Mc68hc908as60 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

9.8 SIM Registers
9.8.1 SIM Break Status Register
MC68HC908AS60 — Rev. 1.0
Address:
The SIM has three memory mapped registers:
The SIM break status register contains a flag to indicate that a break
caused an exit from stop or wait mode.
SBSW — SIM Break Stop/Wait
Reset:
Read:
Write:
•
•
•
This status bit is useful in applications requiring a return to wait or stop
mode after exiting from a break interrupt. Clear SBSW by writing a
logic 0 to it. Reset clears SBSW.
SBSW can be read within the break state SWI routine. The user can
modify the return address on the stack by subtracting one from it. The
code given here is an example of this. Writing 0 to the SBSW bit
clears it.
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1 = Stop mode or wait mode was exited by break interrupt
0 = Stop mode or wait mode was not exited by break interrupt
Break status register, SBSR
Reset status register, SRSR
Break flag control register, SBFCR
$FE00
Bit 7
R
R
Figure 9-17. SIM Break Status Register (SBSR)
System Integration Module (SIM)
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= Reserved
R
6
R
5
R
4
Note: Writing a logic 0 clears SBSW.
R
3
System Integration Module (SIM)
R
2
See Note
SBSW
1
0
Technical Data
SIM Registers
Bit 0
R