MC68HC908GT16 Datasheet, PDF (308/412 Pages) Motorola, Inc – Microcontrollers

System Integration Module (SIM)
FROM RESET
BREAK
YES
INTERRUPT?
NO
YES
I BIT SET?
NO
IRQ
YES
INTERRUPT?
NO
AS MANY INTERRUPTS
AS EXIST ON CHIP
STACK CPU REGISTERS
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
FETCH NEXT
INSTRUCTION
SWI
YES
INSTRUCTION?
NO
RTI
YES
INSTRUCTION?
NO
UNSTACK CPU REGISTERS
EXECUTE INSTRUCTION
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
Technical Data
308
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
System Integration Module (SIM)
MOTOROLA