MC68HC705C9A_1 Datasheet, PDF (49/157 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Release Specification
SPI Interrupt
FROM RESET
Y
I BIT
IN CCR
SET?
N
IRQ OR PORT B
EXTERNAL
Y
INTERRUPT
N
INTERNAL
TIMER
Y
INTERRUPT
N
INTERNAL
SCI
Y
INTERRUPT
N
INTERNAL
SPI
Y
INTERRUPT
N
FETCH NEXT
INSTRUCTION
CLEAR IRQ
REQUEST
LATCH
STACK
PC,X,A,CCR
SET I BIT IN
CC REGISTER
SWI
Y
INSTRUCTION
?
N
Y
RESTORE REGISTERS
FROM STACK:
CCR,A,X,PC
RTI
INSTRUCTION
?
N
EXECUTE
INSTRUCTION
LOAD PC FROM:
SWI: $3FFC-$3FFD
IRQ: $3FFA-$3FFB
TIMER: $3FF8-$3FF9
SCI: $3FF6-$3FF7
SPI: $3FF4-$3FF5
Figure 4-1. Interrupt Flowchart
MC68HC705C9A — Rev. 2.0
Interrupts
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