MC68HC705 MOTOROLA [Motorola, Inc], MC68HC705 Datasheet - Page 57

• Manufacturer Part Number: MC68HC705
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC705C8A — Rev. 2.0
MOTOROLA
Figure 4-5. Reset and Interrupt Processing Flowchart
YES
CCR REGISTER
INSTRUCTION?
INSTRUCTION?
INSTRUCTION
INTERRUPT?
INTERRUPT?
INTERRUPT?
FETCH NEXT
INTERRUPT?
EXTERNAL
I BIT IN
RESET
TIMER
FROM
SET?
IRQ
SCI
SPI
SWI
RTI
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Interrupts
RESTORE REGISTERS FROM STACK:
CLEAR IRQ REQUEST LATCH
EXECUTE INSTRUCTION
1. STACK PC, X, A, CCR
2. SET I BIT
3. LOAD PC WITH VECTOR
TIMER:
CCR, A, X, PC
SWI:
IRQ:
SCI:
SPI:
$1FFC–$1FFD
$1FFA–$1FFB
$1FF8–$1FF9
$1FF6–$1FF7
$1FF4–$1FF5
Interrupt Processing
Technical Data
Interrupts
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