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HC805K3GRS/D bảng dữ liệu(PDF) 41 Page - NXP Semiconductors

tên linh kiện HC805K3GRS/D
Giải thích chi tiết về linh kiện  The low-cost MC68HC805K3 microcontroller is a member of the M68HC805 Family of microprocessors.
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General Release Specification
CPU Interrupt Processing
MC68HC805K3 — Rev. 1.0
Interrupts
41
An RTI instruction is used to signify when the interrupt software service
routine is complete. The RTI instruction causes the register contents 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.
Figure 4-1 shows the sequence of events that occurs during interrupt
processing. Figure 4-2 shows the stacking and unstacking order into the
RAM that is associated with an interrupt service routine.
Figure 4-1. Interrupt Processing Flowchart
FROM
RESET
IS
I BIT
SET?
LOAD PC FROM:
SWI: $03FC, $03FD
IRQ: $03FA-$03FB
TIMER: $03F8-$03F9
SET I BIT IN CCR
STACK PCL, PCH, X, A, CC
CLEAR IRQ
REQUEST
LATCH
RESTORE REGISTERS
FROM STACK
CC, A, X, PCH, PCL
Y
N
IRQ
EXTERNAL
INTERRUPT?
Y
N
TIMER
INTERNAL
INTERRUPT?
Y
N
EXECUTE
INSTRUCTION
FETCH NEXT
INSTRUCTION
RTI
INSTRUCTION
?
Y
N
SWI
INSTRUCTION
?
Y
N
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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