mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 257
mc68hc908bd48
Manufacturer Part Number
mc68hc908bd48
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908BD48.pdf
(288 pages)
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19.1 Contents
19.2 Introduction
MC68HC908BD48
Freescale Semiconductor
Data Sheet — MC68HC908BD48
Section 19. Computer Operating Properly (COP)
—
Rev. 2.1
19.2
19.3
19.4
19.4.1
19.4.2
19.4.3
19.4.4
19.4.5
19.4.6
19.4.7
19.4.8
19.5
19.6
19.7
19.8
19.8.1
19.8.2
19.9
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 CONFIG register.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .261
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .258
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
COP Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .261
COP Module During Break Mode . . . . . . . . . . . . . . . . . . . . . . 262
Computer Operating Properly (COP)
OSCXCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259
STOP Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
COPCTL Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259
Power-On Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
Internal Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Reset Vector Fetch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
COPD (COP Disable). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
COPRS (COP Rate Select) . . . . . . . . . . . . . . . . . . . . . . . . 260
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .262
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .262
Data Sheet
257
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