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| 型号： | ST624XB-DBE |
| 厂商： | 意法半导体 |
| 英文描述： | REAL TIME EMULATION DEVELOPMENT TOOLS FOR ST6 MCU FAMILY |
| 中文描述： | 实时仿真开发工具，ST6单片机系列 |
| 文件页数： | 23/74页 |
| 文件大小： | 733K |
| 代理商： | ST624XB-DBE |
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ST62T46B/E46B
3.3 DIGITAL WATCHDOG
The digital Watchdog consists of a reloadable
downcounter timer which can be used to provide
controlled recovery from software upsets.
The Watchdog circuit generates a Reset when the
downcounter reaches zero. User software can
prevent this reset by reloading the counter, and
should therefore be written so that the counter is
regularly reloaded while the user program runs
correctly. In the event of a software mishap (usual-
ly caused by externally generated interference),
the user program will no longer behave in its usual
fashion and the timer register will thus not be re-
loaded periodically. Consequently the timer will
decrement down to 00h and reset the MCU. In or-
der to maximise the effectiveness of the Watchdog
function, user software must be written with this
concept in mind.
Watchdog behaviour is governed by one option,
known as “WATCHDOG ACTIVATION” (i.e.
HARDWARE or SOFTWARE) (See
Table 6
).
In the SOFTWARE option, the Watchdog is disa-
bled until bit C of the DWDR register has been set.
When the Watchdog is disabled, low power Stop
mode is available. Once activated, the Watchdog
cannot be disabled, except by resetting the MCU.
In the HARDWARE option, the Watchdog is per-
manently enabled. Since the oscillator will run con-
tinuously, low power mode is not available. The
STOP instruction is interpreted as a WAIT instruc-
tion, and the Watchdog continues to countdown.
When the MCU exits STOP mode (i.e. when an in-
terrupt is generated), the Watchdog resumes its
activity.
Table 6. Recommended Option Choices
Functions Required
Stop Mode
Watchdog
Recommended Options
“SOFTWARE WATCHDOG”
“HARDWARE WATCHDOG”
相关PDF资料 |
PDF描述 |
|---|---|
| ST6263C | 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. A/D CONVERTER. SAFE RESET. AUTO-RELOAD TIMER. EEPROM AND SPI |
| ST6265C | 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. A/D CONVERTER. SAFE RESET. AUTO-RELOAD TIMER. EEPROM AND SPI |
| ST62E35BG1 | 8-BIT MICROCONTROLLER |
| ST62P08CM3 | 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. A/D CONVERTER. OSCILLATOR SAFEGUARD. SAFE RESET AND 20 PINS |
| ST62P08CM6 | 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. A/D CONVERTER. OSCILLATOR SAFEGUARD. SAFE RESET AND 20 PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST624XB-KIT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:STARTER KIT DATASHEET FOR ST624X |
| ST624XB-KIT/110 | 功能描述:开发板和工具包 - 其他处理器 ST624X Starter Kit RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| ST624XB-KIT/UK | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:ST62 KIT |
| ST6252 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, AUTO-RELOAD TIMER AND EEPROM |
| ST6252BB1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, AUTO-RELOAD TIMER AND EEPROM |
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