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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny43U датащи(PDF) 49 Page - ATMEL Corporation |
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ATtiny43U датащи(HTML) 49 Page - ATMEL Corporation |
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49 / 182 page  49 8048B–AVR–03/09 9.2 Reset Sources The ATtiny43U has four sources of reset: • Power-on Reset. The MCU is reset when the supply voltage is below the Power-on Reset threshold (V POT). • External Reset. The MCU is reset when a low level is present on the RESET pin for longer than the minimum pulse length when RESET function is enabled. • Watchdog Reset. The MCU is reset when the Watchdog Timer period expires and the Watchdog is enabled. • Brown-out Reset. The MCU is reset when the supply voltage V CC is below the Brown-out Reset threshold (V BOT) and the Brown-out Detector is enabled. 9.3 Power-on Reset A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level is defined in Table 20-4 on page 158. The POR is activated whenever V CC is below the detection level. The POR circuit can be used to trigger the Start-up Reset, as well as to detect a failure in supply voltage. A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the Power-on Reset threshold voltage invokes the delay counter, which determines how long the device is kept in RESET after V CC rise. The RESET signal is activated again, without any delay, when V CC decreases below the detection level. Figure 9-2. MCU Start-up, RESET Tied to V CC Figure 9-3. MCU Start-up, RESET Extended Externally V RESET TIME-OUT INTERNAL RESET t TOUT V POT V RST CC RESET TIME-OUT INTERNAL RESET t TOUT V POT V RST VCC |
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