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參數(shù)資料
| 型號(hào)： | ST72F324BK6T6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, PLASTIC, TQFP-32 |
| 文件頁(yè)數(shù)： | 146/188頁(yè) |
| 文件大?。?/td> | 2867K |
| 代理商： | ST72F324BK6T6 |
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On-chip peripherals
ST72324B
10
On-chip peripherals
10.1
Watchdog timer (WDG)
10.1.1
Introduction
The Watchdog timer is used to detect the occurrence of a software fault, usually generated
by external interference or by unforeseen logical conditions, which causes the application
program to abandon its normal sequence. The Watchdog circuit generates an MCU reset on
expiry of a programmed time period, unless the program refreshes the counter’s contents
before the T6 bit becomes cleared.
10.1.2
Main features
●
Programmable free-running downcounter
●
Programmable reset
●
Reset (if Watchdog activated) when the T6 bit reaches zero
●
Optional reset on HALT instruction (configurable by option byte)
●
Hardware Watchdog selectable by option byte
10.1.3
Functional description
The counter value stored in the Watchdog Control register (WDGCR bits T[6:0]), is
decremented every 16384 fOSC2 cycles (approx.), and the length of the timeout period can
be programmed by the user in 64 increments.
If the watchdog is activated (the WDGA bit is set) and when the 7-bit timer (bits T[6:0]) rolls
over from 40h to 3Fh (T6 becomes cleared), it initiates a reset cycle pulling low the reset pin
for typically 30s.
The application program must write in the WDGCR register at regular intervals during
normal operation to prevent an MCU reset. This downcounter is free-running: it counts down
even if the watchdog is disabled. The value to be stored in the WDGCR register must be
between FFh and C0h:
●
The WDGA bit is set (Watchdog enabled)
●
The T6 bit is set to prevent generating an immediate reset
●
The T[5:0] bits contain the number of increments which represents the time delay
before the Watchdog produces a reset (see Figure 33: Approximate timeout duration).
The timing varies between a minimum and a maximum value due to the unknown
status of the prescaler when writing to the WDGCR register (see Figure 34).
Following a reset, the watchdog is disabled. Once activated it cannot be disabled, except by
a reset.
The T6 bit can be used to generate a software reset (the WDGA bit is set and the T6 bit is
cleared).
If the Watchdog is activated, the HALT instruction generates a reset.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST72F324BK4T6 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| ST72F324BJ4B5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST72F324BJ2B5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST72F324BJ4B6 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST72F324BK4B5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST72F324BK6T6TR | 功能描述:8位微控制器 -MCU 8-bit MCU 3.8 to 5.5V 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| ST72F324BK6TAE | 功能描述:8位微控制器 -MCU 8B MCU 3.8 to 5.5V 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| ST72F324BK6TAS | 制造商:STMicroelectronics 功能描述:MCU 8BIT ST7 CISC 32KB FLASH 5V 32TQFP - Trays 制造商:STMicroelectronics 功能描述:8-bit MCU for automotive, 3.8 to 5.5V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI |
| ST72F324BK6TAXS | 制造商:STMicroelectronics 功能描述: |
| ST72F324BK6TCE | 制造商:STMicroelectronics 功能描述: |
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