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| 型号： | ST6265C |
| 英文描述： | 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. A/D CONVERTER. SAFE RESET. AUTO-RELOAD TIMER. EEPROM AND SPI |
| 中文描述： | 8位微控制器（MCU）的与检察官办公室。光盘。 FASTROM。存储器。的A / D转换器。安全复位。自动重加载定时器。的EEPROM和SPI |
| 文件页数： | 27/84页 |
| 文件大小： | 918K |
| 代理商： | ST6265C |
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ST62T53C/T60C/T63C ST62E60C
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 two options,
known as “WATCHDOG ACTIVATION” (i.e.
HARDWARE or SOFTWARE) and “EXTERNAL
STOP MODE CONTROL” (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.
However, when the EXTERNAL STOP MODE
CONTROL option has been selected low power
consumption may be achieved in Stop Mode.
Execution of the STOP instruction is then gov-
erned by a secondary function associated with the
NMI pin. If a STOP instruction is encountered
when the NMI pin is low, it is interpreted as WAIT,
as described above. If, however, the STOP in-
struction is encountered when the NMI pin is high,
the Watchdog counter is frozen and the CPU en-
ters STOP mode.
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
Stop Mode
Watchdog
Recommended Options
“EXTERNAL STOP MODE” & “HARDWARE WATCHDOG”
“SOFTWARE WATCHDOG”
“HARDWARE WATCHDOG”
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST626X | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8/16-Bit Micros |
| ST626XC-KIT | 制造商:STMicroelectronics 功能描述:ST625X, 6X KIT - Bulk |
| ST626XC-KIT/EU | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DEVELOPMENT KIT ST626 EURO |
| ST626XC-KIT/UK | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:ST62 KIT |
| ST626XC-KIT/US | 功能描述:开发板和工具包 - 其他处理器 ST626X 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: |
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