68HC705SP7 datasheet(51/230 Pages) FREESCALE

tên linh kiện	68HC705SP7

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Interrupts

External Interrupts

MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0

General Release Specification

Interrupts

With the edge- and level-sensitive trigger MOR option, a falling edge or

a low level on the IRQ/VPP pin latches an external interrupt request. The

edge- and level-sensitive trigger MOR option allows connection to the

IRQ/VPP pin of multiple wired-OR interrupt sources. As long as any

source is holding the IRQ low, an external interrupt request is present,

and the CPU continues to execute the interrupt service routine.

With the edge-sensitive-only trigger option, a falling edge on the

IRQ/VPP pin latches an external interrupt request. A subsequent

interrupt request can be latched only after the voltage level on the

IRQ/VPP pin returns to a logic one and then falls again to logic zero.

Figure 4-3. External Interrupt Logic

PA3

PA2

PA1

PA0

IRQ

LATCH

VDD

RST

IRQ VECTOR FETCH

IRQ STATUS/CONTROL REGISTER ($000D)

EXTERNAL

INTERRUPT

REQUEST

INTERNAL DATA BUS

TO BIH & BIL

INSTRUCTION

PROCESSING

VPP TO

USER EPROM

AND PEPROM

MASK OPTION REGISTER ($1FF1)

IRQ/VPP

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