XC68HC05P18A Motorola, XC68HC05P18A Datasheet - Page 41

• Manufacturer Part Number: XC68HC05P18A
• Description: HCMOS Microcontroller Unit
• Manufacturer: Motorola

MC68HC05P18A
MOTOROLA
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.
Y
FETCH NEXT INSTRUCTION
EXECUTE INSTRUCTION
INSTRUCTION?
INSTRUCTION?
FROM RESET
INTERRUPT?
INTERRUPT?
IS I BIT
N
TIMER
SET?
N
N
N
N
IRQ
SWI
RTI
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
41