MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 171

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MC68HC708AS48

Manufacturer Part Number
MC68HC708AS48
Description
Advance Information
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
13.1 Contents
13.2 Introduction
MC68HC708AS48
MOTOROLA
Advance Information — MC68HC708AS48
Section 13. Computer Operating Properly (COP)
Rev. 4.0
13.2
13.3
13.4
13.4.1
13.4.2
13.4.3
13.4.4
13.4.5
13.4.6
13.4.7
13.5
13.6
13.7
13.8
13.8.1
13.8.2
13.9
This section describes the computer operating properly (COP) module,
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 periodically clearing the COP counter.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
COP Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .176
COP Module During Break Interrupts . . . . . . . . . . . . . . . . . . .176
Computer Operating Properly (COP)
CGMXCLK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
STOP Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
COPCTL Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
Internal Reset Resources . . . . . . . . . . . . . . . . . . . . . . . . .174
Reset Vector Fetch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
COPD (COP Disable) . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
COPL (COP Long Timeout) . . . . . . . . . . . . . . . . . . . . . . .175
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .176
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .176
Advance Information
171

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