參數(shù)資料
型號(hào)： ST52513F3
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： MICROCONTROLLER, PDSO20
封裝： ROHS COMPLIANT, SOP-20
文件頁(yè)數(shù)： 106/136頁(yè)
文件大?。?/td> 2791K
代理商： ST52513F3
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)當(dāng)前第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)
11 WATCHDOG TIMER
11.1 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 ICU reset on expiry of a programmed
time period, unless the program refreshes the
WDT before the end of the programmed time
delay. Sixteen different delays can be selected by
using the WDT configuration register.
After the end of the delay programmed by the
configuration register, if the WDT is active, it starts
a reset cycle pulling the reset signal low.
Once the WDT is activated, the application
program has to refresh the counter (by the
WDTRFR instruction) during normal operation in
order to prevent an ICU reset.
In ST52F510/F513 devices it is possible to choose
between “Hardware” or “Software” Watchdog. The
Hardware WDT allows the counting to avoid
unwanted stops for external interferences. The first
mode is always enabled unless the Option Byte 4
(WDT_EN) is written with a special code
(10101010b): only this code can switch the WDT in
“Software” Mode, the other 255 possibilities keep
the “Hardware” Mode enabled.
The WDT is started and refreshed by using the
WDTRFR instruction. When the software mode is
enabled, the WDTSLP instruction stops the WDT
avoiding timeout resets.
When the WDT is in Hardware Mode, neither the
WDTSLP instruction nor external interference can
stop the counting. The “Hardware” WDT is always
enabled after a Reset.
Figure 11.1 Watchdog Block Diagram
The working frequency of WDT (PRES CLK in the
Figure 11.1) is equal to the clock master. The clock
master is divided by 500, obtaining the WDT CLK
signal that is used to fix the timeout of the WDT.
According to the WDT_CR Configuration Register
values, a WDT delay between 0.1ms and 937.5ms
can be defined when the clock master is 5 MHz. By
changing the clock master frequency the timeout
delay can be calculated according to the
configuration register values. The first 4 bits of the
WDT_CR register are used, obtaining 16 different
delays.
11.2 Register Description
SW Watchdog Enable (WDT_EN)
Option Byte 4 (04h)
Bit 7-0: WDTEN7-0 SW Watchdog Enable byte
Writing the code 10101010 in this byte the
Software Watchdog mode is enabled.
D0
D1
D2
D3
Configuration Register
RESET
WDTRFR
PRES CLK = CLK MASTER
WDTSLP
PRESCALER
WDT
RESET
GENERATOR
RESET
WTD CLK
Table 11.1 Watchdog Timing Range (5 MHz)
WDT timeout period (ms)
min
0.1
max
937.5
70
WDTEN7 WDTEN6 WDTEN5 WDTEN4 WDTEN3 WDTEN2 WDTEN1 WDTEN0
相關(guān)PDF資料
PDF描述
ST72361AR6TA 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
ST72361AR9TC 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
ST72P361J4TA 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44
ST72F321BAR7TARE 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP64
ST72P321B(AR6)TCXXXE 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP64
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST52513G2 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH
ST52513G3 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH
ST52513K2 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH
ST52513K3 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH
ST52513Y2 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT ICU WITH 10-BIT ADC. TWO TIMERS/PWM. I2C. SPI. SCI. UP TO 8K FLASH
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*