MC68HC08AZ0 Datasheet, PDF (101/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
System Integration Module (SIM)
Break interrupts
CLI
LDA #$FF
BACKGROUND ROUTINE
INT1
PSHH
PULH
RTI
INT1 INTERRUPT SERVICE ROUTINE
INT2
PSHH
PULH
RTI
INT2 INTERRUPT SERVICE ROUTINE
Figure 10. Interrupt recognition example
NOTE: A software interrupt pushes PC onto the stack. A software interrupt does
not push PC – 1, as a hardware interrupt does.
Reset
All reset sources always have equal and highest priority and cannot be
arbitrated.
Break interrupts
The break module can stop normal program flow at a
software-programmable break point by asserting its break interrupt
output. See Break Module on page 139. The SIM puts the CPU into the
break state by forcing it to the SWI vector location. Refer to the break
interrupt subsection of each module to see how each module is affected
by the break state.
15-sim
MOTOROLA
System Integration Module (SIM)
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MC68HC08AZ0
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