MC68HC05K0 Datasheet, PDF(51/154 Page) Freescale Semiconductor, Inc

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MC68HC05K0 Datasheet, PDF (51/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

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Freescale Semiconductor, Inc.

Interrupts

Interrupt Processing

Table 4-1 summarizes the reset and interrupt sources and vector

assignments.

Table 4-1. Reset/Interrupt Vector Addresses

Function Source

Local

Mask

Global

Mask

Priority

(1 = Highest)

Vector Address

Power-on

logic

RESET pin

COP

Reset

watchdog(1)

None

$03FEâ$03FF

Low-voltage

detect(2)

Illegal

address

logic

Software

interrupt

(SWI)

User code

None

Same priority

as instruction

$03FCâ$03FD

IRQ/VPP pin

PA3 pin(3)

External

interrupts

PA2 pin(3) IRQE bit

I bit

PA1 pin(3)

$03FAâ$03FB

PA0 pin(3)

Timer

interrupts

TOF bit

RTIF bit

TOIE bit

RTIE bit

I bit

$03F8â$03F9

1. The computer operating properly (COP) watchdog is a mask option.

2. The low-voltage reset function is a mask option.

3. Port A interrupt capability is a mask option.

NOTE:

If more than one interrupt request is pending, the CPU fetches the vector

of the higher priority interrupt first. A higher priority interrupt does not

interrupt a lower priority interrupt service routine unless the lower priority

interrupt service routine clears the I bit.

MC68HC05K0 â¢ MC68HC05K1 â Rev. 2.0

Interrupts

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Technical Data

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