68HC05P9A datasheet(29/90 Pages) FREESCALE

Part #	68HC05P9A

Description	SPECIFICATION(General Release)

PDF	90 Pages

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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GENERAL RELEASE SPECIFICATION

INTERRUPTS

Rev. 2.0

4-3

4.2

Timer Interrupt

Three different timer interrupt ﬂags cause a timer interrupt when they are set and

enabled. The interrupt ﬂags are in the timer status register (TSR), and the enable

bits are in the timer control register (TCR). Any of these interrupts will vector to

the same interrupt service routine, located at the address speciﬁed by the

contents of memory location $1FF8 and $1FF9.

From

RESET

External

Interrupt

IRQ

Internal Interrupt

Timer

I Bit

Set

Load PC From:

IRQ: $1FFA-$1FFB

Timer: $1FF8-$1FF9

Set

I Bit

Stack

PC, X, A, CC

Clear IRQ

Request

Latch

Complete

Interrupt

Routine

and Execute

RTI

Fetch

Instruction

Execute

Instruction

Figure 4-1. Hardware Interrupt Flowchart

Freescale Semiconductor, Inc.

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68HC05P9A Datasheet(PDF) 29 Page - Freescale Semiconductor, Inc

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