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ATmega16 Datasheet(PDF) 39 Page - ATMEL Corporation |
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ATmega16 Datasheet(HTML) 39 Page - ATMEL Corporation |
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39 / 357 page  39 2466S–AVR–05/09 ATmega16(L) Power-on Reset A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level is defined in Table 15. 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 16. MCU Start-up, RESET Tied to V CC. Figure 17. 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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