參數(shù)資料
型號： ST7FLCD1G9M1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO28
封裝： ROHS COMPLIANT, SO-28
文件頁數(shù)： 73/96頁
文件大?。?/td> 846K
代理商： ST7FLCD1G9M1
ST7FLCD1
Watchdog Timer (WDG)
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 when the
programmed time period expires, unless the program refreshes the counter’s contents before the
T6 bit is cleared. In addition, a second counter prevents the Watchdog register from being updated
at intervals that are too close.
12.2
Main Features
● Programmable timer (64 increments of 50000 CPU cycles)
● Programmable reset
● Reset (if watchdog enabled) when the T6 bit reaches zero
● Reset (if watchdog enabled) on HALT instruction
● Lock-up Counter for preventing short time refreshes
12.3
Main Watchdog Counter
The counter value stored in the CR register (bits T[6:0]), is decremented every 50000 clock cycles,
and the length of the time out period can be programmed by the user in 64 increments.
If the watchdog is enabled (bit WDGA is set) and when the 7-bit timer (bits T[6:0]) rolls over from
40h to 3Fh (T6 is cleared), it initiates a reset cycle pulling low the reset pin for typically 500 ns:
● The WDGA bit is set (watchdog enabled)
● Bit T6 is set to prevent generating an immediate reset
● Bits T[5:0] contain the number of increments which represents the time delay before the
watchdog produces a reset.
Following a reset, the watchdog is disabled. Once activated it cannot be disabled, except by a reset.
Figure 40: Watchdog Block Diagram
Reset
WDGA
7-bit Downcounter
fCPU
T6
T0
Clock Divider
Watchdog Control Register (CR)
÷50000
T1
T2
T3
T4
T5
Lock-up Counter
(256 fCPU)
Write
Access
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ST7FLI15BF1U6 功能描述:8位微控制器 -MCU 8-Bit MCU w/ Single Volt Flash 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
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ST7FLI19BF1U6TR 功能描述:8位微控制器 -MCU 8-Bit MCU w/ Single Volt Flash 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
ST7FLI19BY1M3TR 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(shí)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
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