參數(shù)資料
型號： ST72F60E1M1
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, PDSO24
封裝： 0.300 INCH, LEAD FREE, PLASTIC, SOP-24
文件頁數(shù)： 79/139頁
文件大小： 1993K
代理商： ST72F60E1M1
Watchdog timer (WDG)
ST7260xx
44/139
12
Watchdog timer (WDG)
12.1
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.
12.2
Main features
●
Programmable free-running counter (64 increments of 49,152 CPU cycles)
●
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.
12.3
Functional description
The counter value stored in the CR register (bits T6:T0), is decremented every 49,152
machine cycles, 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 T6:T0) rolls
over from 40h to 3Fh (T6 becomes cleared), it initiates a reset cycle pulling low the reset pin
for a period of tDOG (see Table 62: Control timings on page 114).
The application program must write in the CR 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 CR register must be between FFh
●
The WDGA bit is set (watchdog enabled)
●
The T6 bit is set to prevent generating an immediate reset
●
The T5:T0 bits contain the number of increments which represents the time delay
before the watchdog produces a reset.
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相關代理商/技術參數(shù)
參數(shù)描述
ST72F60E2M1 功能描述:8位微控制器 -MCU ST7262 Lo Spd USB 8B MCU 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 安裝風格:SMD/SMT
ST72F60K1U1 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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 安裝風格:SMD/SMT
ST72F60K1U1TR 功能描述:8位微控制器 -MCU ST7262 Lo Spd USB 8B MCU 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 安裝風格:SMD/SMT
ST72F60K2B1 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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 安裝風格:SMD/SMT
ST72F60K2U1TR 功能描述:8位微控制器 -MCU ST7262 Lo Spd USB 8B MCU 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 安裝風格:SMD/SMT
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