MC68HC908GR4 MOTOROLA [Motorola, Inc], MC68HC908GR4 Datasheet - Page 294

• Manufacturer Part Number: MC68HC908GR4
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

System Integration Module (SIM)
19.8.1 SIM Break Status Register
Technical Data
294
This code works if the H register has been pushed onto the stack in the break
service routine software. This code should be executed at the end of the break
service routine software.
HIBYTE
LOBYTE
EQU
EQU
If not SBSW, do RTI
BRCLR
TST
BNE
5
6
SBSW,SBSR, RETURN
LOBYTE,SP
DOLO
Note: 1. Writing a logic 0 clears SBSW.
Address:
The SIM break status register (SBSR) contains a flag to indicate that a
break caused an exit from stop mode or wait mode.
SBSW — SIM Break Stop/Wait
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.
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.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Stop mode or wait mode was exited by break interrupt.
0 = Stop mode or wait mode was not exited by break interrupt.
$FE00
Bit 7
Figure 19-20. SIM Break Status Register (SBSR)
R
R
0
System Integration Module (SIM)
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= Reserved
R
6
0
;
;
;
;
;
;If RETURNLO is not zero,
;then just decrement low byte.
See if wait mode or stop mode was exited by
break.
R
5
0
R
4
0
R
3
0
MC68HC908GR8 — Rev 4.0
R
2
0
SBSW
Note
1
0
(1)
MOTOROLA
Bit 0
R
0