MC68HC705J1ACPE Datasheet, PDF (69/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.
Technical Data — MC68HC705J1A
Section 4. Resets and Interrupts
4.1 Contents
4.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.3 Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.3.1 Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
4.3.2 External Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.3.3 COP Watchdog Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.3.4 Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.4 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.4.1 Software Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.4.2 External Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
4.4.3 Timer Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4.3.1 Real-Time Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4.3.2 Timer Overflow Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4.4 Interrupt Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.2 Introduction
Reset initializes the microcontroller unit (MCU) by returning the program
counter to a known address and by forcing control and status bits to
known states.
Interrupts temporarily change the sequence of program execution to
respond to events that occur during processing.
MC68HC705J1A — Rev. 4.0
Resets and Interrupts
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Technical Data