MC68HC705J MOTOROLA [Motorola, Inc], MC68HC705J Datasheet - Page 69

• Manufacturer Part Number: MC68HC705J
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

4.1 Contents
4.2 Introduction
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data — MC68HC705J1A
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
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.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
External Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
COP Watchdog Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Software Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
External Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Timer Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Interrupt Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Real-Time Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Timer Overflow Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . 76
Resets and Interrupts
Section 4. Resets and Interrupts
Technical Data
69