mc908jl16 Freescale Semiconductor, Inc, mc908jl16 Datasheet - Page 161

• Manufacturer Part Number: mc908jl16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 13
Computer Operating Properly (COP)
13.1 Introduction
The computer operating properly (COP) module contains a free-running counter that generates a reset if
allowed to overflow. The COP module helps software recover from runaway code. Prevent a COP reset
by clearing the COP counter periodically. The COP module can be disabled through the COPD bit in the
CONFIG1 register.
13.2 Functional Description
Figure 13-1
Freescale Semiconductor
INTERNAL RESET SOURCES
(COPRS FROM CONFIG1)
COPD (FROM CONFIG1)
RESET VECTOR FETCH
shows the structure of the COP module.
COPEN (FROM SIM)
COPCTL WRITE
COPCTL WRITE
COP RATE SEL
RESET
ICLK
(1)
Figure 13-1. COP Block Diagram
COP MODULE
MC68HC908JL16 Data Sheet, Rev. 1.1
COP CLOCK
12-BIT SIM COUNTER
COP COUNTER
6-BIT COP COUNTER
CLEAR
SIM
RESET STATUS REGISTER
SIM RESET CIRCUIT
161