- 您现在的位置：买卖IC网 > PDF目录98143 > ST52E430B/D (STMICROELECTRONICS) 8-BIT, UVPROM, 20 MHz, MICROCONTROLLER, CDIP32 PDF资料下载
参数资料
| 型号： | ST52E430B/D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, UVPROM, 20 MHz, MICROCONTROLLER, CDIP32 |
| 封装： | WINDOWED, SHRINK, CERAMIC, DIP-32 |
| 文件页数： | 62/120页 |
| 文件大小： | 502K |
| 代理商： | ST52E430B/D |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页当前第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页
46/120
ST52T430/E430
8 WATCHDOG TIMER
8.1 Functional Description
The Watchdog Timer (WDT) 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 WDT circuit
generates an MCU reset on expiry of a
programmed time period, unless the program
refreshes the WDT before the end of the
programmed time delay.
16 different delay can be selected by using the
WDT configuration register.
If the WDT is activated (by using the assembler
instruction WDTSFR) after the end of the delay
programmed by the configuration register, it start a
reset cycle pulling low the reset pin.
The application program once activated the WDT
has to refresh this peripheral (by the WDTSFR
instruction) at regular intervals during normal
operation to prevent an MCU reset.
To stop the WDT during the user program
executions the instruction WDTSLP has to be used.
The working frequency of the WDT (PRES CLK in
the Figure 8.1) is equal to the clock master. The
clock master is then divided by 500 thus obtaining
the WDT CLK signal that is used to fix the timeout of
the WDT.
D0
D1
D2
D3
REG_CONF 2
RESET
WDTRFR
PRES CLK = CLK MASTER
WDTSLP
PRESCALER
WDT
RESET
GENERATOR
RESET
WTD CLK
Figure 8.1 Watchdog Block Diagram
According to the WDT configuration register
values it possible to define a WDT delay between
0.1 mS and 937.5 mS when the clock master is 5
MHz. Changing the clock master frequency the
timeout delay can be calculated according to the
configuration register values REG_CONF 2 as
described in the following section.
WDT timeout period (mS)
min
0.1
max
937.5
Table 8.1 Watchdog Timing range (CLK=5
MHz)
相关PDF资料 |
PDF描述 |
|---|---|
| ST52F510F1M6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO20 |
| ST52F510G0B6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP28 |
| ST52F513F0M6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO20 |
| ST52F513F1B6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP20 |
| ST52F513G1M6 | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST52E430K1B6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Three Timer/PWMs, ADC, SCI |
| ST52E430K1M6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Three Timer/PWMs, ADC, SCI |
| ST52E430K1T6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Three Timer/PWMs, ADC, SCI |
| ST52E430K2B6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Three Timer/PWMs, ADC, SCI |
| ST52E430K2M6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Three Timer/PWMs, ADC, SCI |
发布紧急采购，3分钟左右您将得到回复。