參數(shù)資料
型號(hào)： ST72124J2B7
廠商： 意法半導(dǎo)體
英文描述： 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
中文描述： 8位單電壓閃存，ADC和16位定時(shí)器，SPI和脊髓損傷界面微控制器
文件頁(yè)數(shù)： 50/125頁(yè)
文件大?。?/td> 776K
代理商： ST72124J2B7
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ST72334J/N, ST72314J/N, ST72124J
50/125
6.3 WATCHDOG TIMER (WDG)
6.3.1 Introduction
The Watchdog timer is used to detect the occur-
rence of a software fault, usually generated by ex-
ternal interference or by unforeseen logical condi-
tions, which causes the application program to
abandon its normal sequence. The Watchdog cir-
cuit generates an MCU reset on expiry of a pro-
grammed time period, unless theprogram refresh-
es the counter’s contents before the T6 bit be-
comes cleared.
6.3.2 Main Features
I
Programmable timer (64 increments of 12288
CPU cycles)
I
Programmable reset
I
Reset (if watchdog activated) after a HALT
instruction or when the T6 bit reaches zero
I
Hardware Watchdog selectable by option byte
I
Watchdog Reset indicated by status flag (in
versions with Safe Reset option only)
6.3.3 Functional Description
The counter value stored in the CR register (bits
T[6:0]), is decremented every 12,288 machine cy-
cles, 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
500ns.
Figure 34. Watchdog Block Diagram
RESET
WDGA
7-BIT DOWNCOUNTER
f
CPU
T6
T0
CLOCK DIVIDER
÷
12288
WATCHDOG CONTROL REGISTER (CR)
T1
T2
T3
T4
T5
相關(guān)PDF資料
PDF描述
ST72C124J2B7 CAP 120PF 25V CERAMIC X7R 0402
ST72124J2T6 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
ST72C124J2T6 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
ST72124J2T7 CAP 180PF 25V CERAMIC X7R 0402
ST72C124J2T7 CAP 1800PF 25V CERAMIC 0402 SMD
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST72124J2B7/XXX 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
ST72124J2T 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
ST72124J2T1 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
ST72124J2T1/XXX 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
ST72124J2T3 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
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