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ATtiny13A 数据表(PDF) 36 Page - ATMEL Corporation |
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ATtiny13A 数据表(HTML) 36 Page - ATMEL Corporation |
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36 / 174 page ![]() 36 8126D–AVR–11/09 ATtiny13A 8.2 Reset Sources The ATtiny13A has four sources of reset: • Power-on Reset. The MCU is reset when the supply voltage is below the Power-on Reset threshold (VPOT). • External Reset. The MCU is reset when a low level is present on the RESET pin for longer than the minimum pulse length. • 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 VCC is below the Brown-out Reset threshold (VBOT) and the Brown-out Detector is enabled. 8.2.1 Power-on Reset A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level is defined in “System and Reset Characteristics” on page 120. The POR is activated whenever VCC 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 VCC rise. The RESET signal is activated again, without any delay, when VCC decreases below the detection level. Figure 8-2. MCU Start-up, RESET Tied to VCC Figure 8-3. 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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