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ATMEGA16 Datasheet(PDF) 35 Page - ATMEL Corporation |
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ATMEGA16 Datasheet(HTML) 35 Page - ATMEL Corporation |
35 / 315 page 35 ATmega16(L) 2466E–AVR–10/02 Figure 15. Reset Logic Notes: 1. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling). 2. VBOT may be below nominal minimum operating voltage for some devices. For devices where this is the case, the device is tested down to V CC = VBOT during the production test. This guarantees that a Brown-out Reset will occur before V CC drops to a voltage where correct operation of the microcontroller is no longer guaranteed. The test is performed using BODLEVEL = 1 for ATmega16L and BODLEVEL = 0 for ATmega16. BODLEVEL = 1 is not applicable for ATmega16. Table 15. Reset Characteristics Symbol Parameter Condition Min Typ Max Units VPOT Power-on Reset Threshold Voltage (rising) 1.4 2.3 V Power-on Reset Threshold Voltage (falling) (1) 1.3 2.3 V VRST RESET Pin Threshold Voltage 0.2 VCC 0.85VCC V tRST Minimum pulse width on RESET Pin 50 ns VBOT Brown-out Reset Threshold Voltage (2) BODLEVEL = 1 2.5 2.7 3.2 V BODLEVEL = 0 3.7 4.0 4.2 tBOD Minimum low voltage period for Brown-out Detection BODLEVEL = 1 2 µs BODLEVEL = 0 2 µs VHYST Brown-out Detector hysteresis 50 mV MCU Control and Status Register (MCUCSR) BODEN BODLEVEL Delay Counters CKSEL[3:0] CK TIMEOUT DATA BUS Clock Generator SPIKE FILTER Pull-up Resistor JTAG Reset Register Watchdog Oscillator SUT[1:0] Watchdog Timer Reset Circuit Brown-out Reset Circuit Power-on Reset Circuit |
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