mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 118

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

System Integration Module (SIM)
8.8 SIM Registers
8.8.1 SIM Break Status Register (SBSR)
Technical Data
118
Note 1. Writing a logic 0 clears SBSW.
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 following code is an example of this. Writing 0 to the SBSW bit
clears it.
1 = Stop mode or wait mode was exited by break interrupt
0 = Stop mode or wait mode was not exited by break interrupt
SIM break status register (SBSR)
SIM reset status register (SRSR)
SIM break flag control register (SBFCR)
$FE00
Bit 7
R
Figure 8-19. SIM Break Status Register (SBSR)
System Integration Module (SIM)
R
6
R
5
R
R
4
= Reserved
R
3
MC68HC908JB16
Freescale Semiconductor
R
2
SBSW
Note 1
1
0
—
Rev. 1.1
Bit 0
R