MC68HC05RC17 Datasheet, PDF (42/128 Pages) Freescale Semiconductor, Inc – General Release Specification

Interrupts
Freescale Semiconductor, Inc.
FROM
RESET
Y
I BIT
IN CCR
SET?
N
IRQ/PORT B KEYSCAN Y
EXTERNAL
INTERRUPTS?
N
INTERNAL
Y
CMT
INTERRUPT?
N
INTERNAL
Y
CORE TIMER
INTERRUPT?
N
EIMSK
CLEAR?
N
Y ^{CLEAR IRQ}
REQUEST
LATCH.
FETCH NEXT
INSTRUCTION.
Y
RESTORE REGISTERS
FROM STACK: CCR, A, X, PC.
SWI
Y
INSTRUCTION
?
N
RTI
INSTRUCTION
?
N
EXECUTE
INSTRUCTION.
STACK
PC, X, A, CCR.
SET I BIT IN
CC REGISTER.
LOAD PC FROM
APPROPRIATE
VECTOR.
Figure 4-1. Interrupt Processing Flowchart
General Release Specification
MC68HC05RC17 — Rev. 2.0
Interrupts
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