mc68hc05p18a Freescale Semiconductor, Inc, mc68hc05p18a Datasheet - Page 41

• Manufacturer Part Number: mc68hc05p18a
• Description: Mc68hc05p18a Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

MC68HC05P18A
causes the CPU state to be recovered from the stack and normal
processing to resume at the next instruction that was to be executed
when the interrupt took place.
that occur during interrupt processing.
Freescale Semiconductor, Inc.
Y
FETCH NEXT INSTRUCTION
For More Information On This Product,
EXECUTE INSTRUCTION
INSTRUCTION?
INSTRUCTION?
FROM RESET
INTERRUPT?
INTERRUPT?
IS I BIT
N
TIMER
SET?
N
N
N
N
SWI
IRQ
RTI
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Figure 4-1. Interrupt Processing Flowchart
Interrupts
Y
Y
Y
Y
Figure 4-1
CLEAR IRQ
REQUEST
LATCH
shows the sequence of events
SWI: $3FFC AND $3FFD
TIMER: $3FF8–$3FF9
RESTORE REGISTERS
IRQ: $3FFA–$3FFB
LOAD PC FROM
PC, X, A, CC
I BIT IN CCR
FROM STACK
CC, A, X, PC
STACK
SET
CPU Interrupt Processing
Technical Data
Interrupts