MC68HC05C8A Datasheet, PDF (31/116 Pages) Motorola, Inc – Microcontrollers

FROM
RESET
External Interrupt (IRQ)
Y
I BIT
IN CCR SET?
N
IRQ
EXTERNAL
Y
INTERRUPT
?
N
INTERNAL
Y
TIMER
INTERRUPT
?
N
INTERNAL
Y
SCI
INTERRUPT
?
N
INTERNAL
Y
SPI
INTERRUPT
?
N
FETCH NEXT
INSTRUCTION
Y
RESTORE REGISTERS
FROM STACK:
CCR, A, X, PC
SWI
Y
INSTRUCTION
?
N
RTI
INSTRUCTION
?
N
EXECUTE
INSTRUCTION
CLEAR IRQ
REQUEST LATCH
STACK
PC, X, A, CCR
SET I BIT IN
CC REGISTER
LOAD PC FROM:
SWI: $1FFC-$1FFD
IRQ: $1FFA-$1FFB
TIMER: $1FF8-$1FF9
SCI: $1FF6-$1FF7
Figure 4-1. Interrupt Flowchart
MC68HC05C8A • MC68HCL05C8A • MC68HSC05C8A Data Sheet, Rev. 5.1
Freescale Semiconductor
31