MC68HC705J1A Motorola, MC68HC705J1A Datasheet - Page 69

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MC68HC705J1A

Manufacturer Part Number
MC68HC705J1A
Description
Manufacturer
Motorola
Datasheet

Specifications of MC68HC705J1A

Case
DIP-20L
Technical Data — MC68HC705J1A
4.1 Contents
4.2
4.3
4.3.1
4.3.2
4.3.3
4.3.4
4.4
4.4.1
4.4.2
4.4.3
4.4.3.1
4.4.3.2
4.4.4
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
MOTOROLA
Section 4. Resets and Interrupts
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
External Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
COP Watchdog Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Software Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
External Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Timer Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Real-Time Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Timer Overflow Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . 76
Interrupt Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Resets and Interrupts
Technical Data
69

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