MC68HC705J MOTOROLA [Motorola, Inc], MC68HC705J Datasheet - Page 97

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

7.1 Contents
7.2 Introduction
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data — MC68HC705J1A
Section 7. Computer Operating Properly (COP) Module
7.2
7.3
7.3.1
7.3.2
7.3.3
7.4
7.5
7.6
7.6.1
7.6.2
The computer operating properly (COP) watchdog resets the
microcontroller (MCU) in case of software failure. Software that is
operating properly periodically services the COP watchdog and prevents
COP reset. The COP watchdog function is programmable by the
COPEN bit in the mask option register.
Features include:
•
•
Computer Operating Properly (COP) Module
Protection from runaway software
Wait and halt mode operation
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
COP Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
COP Watchdog Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
COP Watchdog Timeout Period . . . . . . . . . . . . . . . . . . . . . . 98
Clearing the COP Watchdog . . . . . . . . . . . . . . . . . . . . . . . .98
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Technical Data
97