mc68hc705e5 Freescale Semiconductor, Inc, mc68hc705e5 Datasheet - Page 67

• Manufacturer Part Number: mc68hc705e5
• Description: M68hc05 Family Of Microcontrollers Mcus
• Manufacturer: Freescale Semiconductor, Inc

10.1 Contents
10.2 Introduction
MC68HC705E5
General Release Specification — MC68HC705E5
—
Section 10. Computer Operating Properly (COP)
Rev. 1.0
10.2
10.3
10.4
10.5
The COP watchdog system is a mask-programmable feature which will
generate a system reset if not serviced within the specified COP timeout
period. The COP counter chain is derived from an output of the CPI
circuit. This input signal is divided to give the COP reset rate selected by
the first write to the system control and status register (SCSR) located at
address $13.
A COP reset is done by writing a logic 0 to bit zero of address $1FF0.
This will reset the COP counter chain and begin the timeout countdown
again. The COP counter chain is also cleared when the MCU is in reset
or stop mode.
Freescale Semiconductor, Inc.
Computer Operating Properly (COP) Watchdog
For More Information On This Product,
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
System Control and Status Register. . . . . . . . . . . . . . . . . . . . .68
COP During Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
COP During Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Go to: www.freescale.com
General Release Specification
Watchdog