MC68HC705K1 Datasheet, PDF (39/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC705K1
Section 4. Interrupts
4.1 Contents
4.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
4.3 Interrupt Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
4.3.1 Software Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
4.3.2 External Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
4.3.2.1
4.3.2.2
IRQ/V_PP Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
PA3–PA0 Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
4.3.2.3 IRQ Status and Control Register . . . . . . . . . . . . . . . . . . .45
4.3.3 Timer Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
4.3.3.1 Timer Overflow Interrupt . . . . . . . . . . . . . . . . . . . . . . . . .46
4.3.3.2 Real-Time Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
4.4 Interrupt Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
4.2 Introduction
This section describes how interrupts temporarily change the normal
processing sequence.
MC68HC705K1 — Rev. 2.0
Interrupts
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Technical Data