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參數(shù)資料
| 型號： | MC68HC705J1ACP |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers |
| 中文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數(shù)： | 29/108頁 |
| 文件大?。?/td> | 718K |
| 代理商： | MC68HC705J1ACP |
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MC68HC705KJ1 MC68HRC705KJ1 MC68HLC705KJ1 Data Sheet, Rev. 4.1
Freescale Semiconductor
29
Chapter 3
Computer Operating Properly Module (COP)
3.1 Introduction
The computer operating properly (COP) watchdog resets the MCU in case of software failure. Software
that is operating properly periodically services the COP watchdog and prevents COP reset. The COP
watchdog function is programmable by the COPEN bit in the mask option register.
3.2 Features
The computer operating properly module (COP) includes these features:
Protection from runaway software
Wait mode and halt mode operations
3.3 Operation
Operation of the COP module is discussed here.
3.3.1 COP Watchdog Timeout
Four counter stages at the end of the timer make up the COP watchdog. The COP resets the MCU if the
timeout period occurs before the COP watchdog timer is cleared by application software and the IRQ/V
PP
pin voltage is between V
SS
and V
DD
. Periodically clearing the counter starts a new timeout period and
prevents COP reset. A COP watchdog timeout indicates that the software is not executing instructions in
the correct sequence.
NOTE
The internal clock drives the COP watchdog. Therefore, the COP watchdog
cannot generate a reset for errors that cause the internal clock to stop.
The COP watchdog depends on a power supply voltage at or above a
minimum specification and is not guaranteed to protect against brownout.
3.3.2 COP Watchdog Timeout Period
The COP watchdog timer function is implemented by dividing the output of the real-time interrupt circuit
(RTI) by eight. The RTI select bits in the timer status and control register control RTI output, and the
selected output drives the COP watchdog. (See timer status and control register in
Chapter 9
Multifunction Timer Module
.)
NOTE
The minimum COP timeout period is seven times the RTI period. The COP
is cleared asynchronously with the value in the RTI divider; hence, the COP
timeout period will vary between 7x and 8x the RTI period.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC705J1ACPE | 功能描述:8位微控制器 -MCU HCO5 CORE+1.2K RAM + EPR RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC68HC705J2CDW | 制造商:Motorola Inc 功能描述: 制造商:Motorola Inc 功能描述:MicroController, 8-Bit, 20 Pin, Plastic, SOP |
| MC68HC705J2DW | 制造商:Motorola Inc 功能描述: |
| MC68HC705J5ACP | 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC68HC705JB4DW | 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
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