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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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STR720 Scheda tecnica(PDF) 303 Page - STMicroelectronics |
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STR720 Scheda tecnica(HTML) 303 Page - STMicroelectronics |
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303 / 401 page  STR720 - WATCHDOG TIMER (WDG) 303/401 20 WATCHDOG TIMER (WDG) 20.1 Introduction The Watchdog Timer peripheral can be used as free-running timer or as Watchdog to resolve STR720 microcontroller malfunctions due to hardware or software failures. 20.2 Main Features ■ 16-bit down Counter ■ 8-bit clock Prescaler ■ Safe Reload Sequence ■ Free-running Timer mode ■ End of Counting interrupt generation ■ Second clock source (4 kHz derived from 32 kHz RTC clock 20.3 Functional Description Figure 42 shows the functional blocks of the Watchdog Timer module. The module can work as Watchdog or as Free-running Timer. In both working modes the 16-bit Counter value can be accessed through a reading of the WDTCNT register. 20.3.1 Free-running Timer mode If the WE bit of WDTCR register is not written to ‘1’ by software, the peripheral enter in Free-running Timer mode. When in this operating mode as the SC bit of WDTCR register is written to ‘1’ the WDTVR value is loaded in the Counter and the Counter starts counting down. Figure 42. Watchdog Timer Functional Block EOC APB_CLK IRQ / EE ECM EC 16-bit Counter WDTVR Register CLK_AF/8 8-bit Prescaler SC WDTPR Register WE SYS RST 1 |
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