Datasheet

System Integration Module (SIM)
Technical Data MC68HC908GR8 — Rev 4.0
284 System Integration Module (SIM) MOTOROLA
Figure 19-10. Interrupt Processing
19.6.1.1 Hardware Interrupts
A hardware interrupt does not stop the current instruction. Processing of
a hardware interrupt begins after completion of the current instruction.
When the current instruction is complete, the SIM checks all pending
hardware interrupts. If interrupts are not masked (I bit clear in the
NO
NO
NO
YES
NO
NO
YES
NO
YES
YES
AS MANY INTERRUPTS
I BIT SET?
FROM RESET
BREAK
I BIT SET?
IRQ0
INTERRUPT?
IRQ
INTERRUPT?
SWI
INSTRUCTION?
RTI
INSTRUCTION?
FETCH NEXT
INSTRUCTION
UNSTACK CPU REGISTERS
STACK CPU REGISTERS
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
EXECUTE INSTRUCTION
YES
YES
AS EXIST ON CHIP
INTERRUPT?
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