Data Sheet — MC68HC908MR32 • MC68HC908MR16
Section 6. Computer Operating Properly (COP)
6.1 Introduction
This section describes the computer operating properly module, a free-running
counter that generates a reset if allowed to overflow. The computer operating
properly (COP) module helps software recover from runaway code. Prevent a COP
reset by periodically clearing the COP counter.
6.2 Functional Description
Figure 6-1 shows the structure of the COP module. A summary of the input/output
(I/O) register is shown in Figure 6-2.
SIM
SIM RESET CIRCUIT
13-BIT SIM COUNTER
CGMXCLK
SIM RESET STATUS REGISTER
INTERNAL RESET SOURCES(1)
RESET VECTOR FETCH
COPCTL WRITE
COP MODULE
6-BIT COP COUNTER
COPD (FROM CONFIG)
RESET
CLEAR
COP COUNTER
COPCTL WRITE
Note 1. See 14.3.2 Active Resets from Internal Sources.
Figure 6-1. COP Block Diagram
MC68HC908MR32 • MC68HC908MR16 — Rev. 6.0
MOTOROLA Computer Operating Properly (COP)
Data Sheet
83
FREESCALE [ Freescale ]
