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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega169P датащи(PDF) 50 Page - ATMEL Corporation |
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ATmega169P датащи(HTML) 50 Page - ATMEL Corporation |
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50 / 393 page  50 8018N–AVR–08/09 ATmega169P 10.2.3 Brown-out Detection ATmega169P has an On-chip Brown-out Detection (BOD) circuit for monitoring the V CC level during operation by comparing it to a fixed trigger level. The trigger level for the BOD can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike free Brown-out Detection. The hysteresis on the detection level should be interpreted as V BOT+ = V BOT + VHYST/2 and VBOT- = VBOT - VHYST/2.When the BOD is enabled, and VCC decreases to a value below the trigger level (V BOT- in Figure 10-5), the Brown-out Reset is immediately acti- vated. When V CC increases above the trigger level (VBOT+ in Figure 10-5), the delay counter starts the MCU after the Time-out period t TOUT has expired. The BOD circuit will only detect a drop in V CC if the voltage stays below the trigger level for lon- ger than t BOD given in ”System and Reset Characteristics” on page 331. Figure 10-5. Brown-out Reset During Operation 10.2.4 Watchdog Reset When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On the falling edge of this pulse, the delay timer starts counting the Time-out period t TOUT. Refer to page 51 for details on operation of the Watchdog Timer. Figure 10-6. Watchdog Reset During Operation VCC RESET TIME-OUT INTERNAL RESET VBOT- VBOT+ tTOUT CK CC |
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