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ATMEGA128A Datasheet(PDF) 54 Page - ATMEL Corporation |
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ATMEGA128A Datasheet(HTML) 54 Page - ATMEL Corporation |
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54 / 386 page  54 8151G–AVR–07/10 ATmega128A 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 1 CK cycle duration. On the falling edge of this pulse, the delay timer starts counting the Time-out period t TOUT. Refer to “Watchdog Timer” on page 55 for details on operation of the Watchdog Timer. Figure 10-6. Watchdog Reset During Operation 10.3 Internal Voltage Reference ATmega128A features an internal bandgap reference. This reference is used for Brown-out Detection, and it can be used as an input to the Analog Comparator or the ADC. The 2.56V ref- erence to the ADC is generated from the internal bandgap reference. 10.3.1 Voltage Reference Enable Signals and Start-up Time The voltage reference has a start-up time that may influence the way it should be used. The start-up time is given in “System and Reset Characteristics” on page 323. To save power, the reference is not always turned on. The reference is on during the following situations: 1. When the BOD is enabled (by programming the BODEN fuse). 2. When the bandgap reference is connected to the Analog Comparator (by setting the ACBG bit in ACSR). 3. When the ADC is enabled. Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC, the user must always allow the reference to start up before the output from the Analog Comparator or VCC RESET TIME-OUT INTERNAL RESET VBOT- VBOT+ tTOUT CK CC |
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