HC805K3GRSSLASHD datasheet(41/119 Pages) NXP

Part #	HC805K3GRS/D

Description	The low-cost MC68HC805K3 microcontroller is a member of the M68HC805 Family of microprocessors.

PDF	119 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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41 / 119 page

General Release Specification

CPU Interrupt Processing

MC68HC805K3 — Rev. 1.0

Interrupts

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

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

IRQ

EXTERNAL

INTERRUPT?

TIMER

INTERNAL

INTERRUPT?

EXECUTE

INSTRUCTION

FETCH NEXT

INSTRUCTION

RTI

INSTRUCTION

SWI

INSTRUCTION

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC805K3GRS/D Datasheet(PDF) 41 Page - NXP Semiconductors

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