MC908QT4MPE datasheet(74/184 Pages) FREESCALE

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External Interrupt (IRQ)

MC68HC908QY/QT Family Data Sheet, Rev. 5

Freescale Semiconductor

Figure 8-1. Block Diagram Highlighting IRQ Block and Pins

When set, the IMASK bit in INTSCR masks the IRQ interrupt request. A latched interrupt request is not

presented to the interrupt priority logic unless IMASK is clear.

NOTE

The interrupt mask (I) in the condition code register (CCR) masks all

interrupt requests, including the IRQ interrupt request.

A falling edge on the IRQ pin can latch an interrupt request into the IRQ latch. An IRQ vector fetch,

software clear, or reset clears the IRQ latch.

PTA0/AD0/TCH0/KBI0

PTA1/AD1/TCH1/KBI1

PTA2/IRQ/KBI2/TCLK

PTA3/RST/KBI3

PTA4/OSC2/AD2/KBI4

PTA5/OSC1/AD3/KBI5

KEYBOARD INTERRUPT

MODULE

CLOCK

GENERATOR

(OSCILLATOR)

SYSTEM INTEGRATION

MODULE

SINGLE INTERRUPT

MODULE

BREAK

MODULE

POWER-ON RESET

MODULE

16-BIT TIMER

MODULE

COP

MODULE

MONITOR ROM

PTB0

M68HC08 CPU

PTB1

PTB2

PTB3

PTB4

PTB5

PTB6

PTB7

8-BIT ADC

128 BYTES RAM

MC68HC908QY4 AND MC68HC908QT4

4096 BYTES

MC68HC908QY2, MC68HC908QY1,

MC68HC908QT2, AND MC68HC908QT1:

1536 BYTES

USER FLASH

POWER SUPPLY

VDD

VSS

RST, IRQ: Pins have internal (about 30K Ohms) pull up

PTA[0:5]: High current sink and source capability

PTA[0:5]: Pins have programmable keyboard interrupt and pull up

PTB[0:7]: Not available on 8-pin devices – MC68HC908QT1, MC68HC908QT2, and MC68HC908QT4 (see note in

12.1 Introduction)

ADC: Not available on the MC68HC908QY1 and MC68HC908QT1

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