MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 370

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

20.1 Contents
20.2 Introduction
MC68HC908LJ12
Freescale Semiconductor
Technical Data — MC68HC908LJ12
Section 20. Computer Operating Properly (COP)
—
Rev. 2.1
20.2
20.3
20.4
20.4.1
20.4.2
20.4.3
20.4.4
20.4.5
20.4.6
20.4.7
20.4.8
20.5
20.6
20.7
20.8
20.8.1
20.8.2
20.9
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 configuration register 1 (CONFIG1).
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .375
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .372
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
COP Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375
Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .375
COP Module During Break Mode . . . . . . . . . . . . . . . . . . . . . . 376
Computer Operating Properly (COP)
ICLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
STOP Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
COPCTL Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .373
Power-On Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
Internal Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Reset Vector Fetch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
COPD (COP Disable). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
COPRS (COP Rate Select) . . . . . . . . . . . . . . . . . . . . . . . . 374
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .376
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .376
Technical Data
371