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データシートサーチシステム |
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データシートサーチシステム |
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ATMEGA1281V データシート(PDF) 61 Page - ATMEL Corporation |
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ATMEGA1281V データシート(HTML) 61 Page - ATMEL Corporation |
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61 / 449 page  61 ATmega640/1280/1281/2560/2561 2549K–AVR–01/07 Watchdog Reset When the Watchdog times out, it will generate a short reset pulse of one CK cycle dura- tion. On the falling edge of this pulse, the delay timer starts counting the Time-out period t TOUT. See “Watchdog Timer” on page 53. for details on operation of the Watchdog Timer. Figure 29. Watchdog Reset During Operation Internal Voltage Reference ATmega640/1280/1281/2560/2561 features an internal bandgap reference. This refer- ence is used for Brown-out Detection, and it can be used as an input to the Analog Comparator or the ADC. 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 Table 29. 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 BODLEVEL [2:0] 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 Com- parator or ADC is used. To reduce power consumption in Power-down mode, the user can avoid the three conditions above to ensure that the reference is turned off before entering Power-down mode. Note: 1. Values are guidelines only. Actual values are TBD. CK CC Table 29. Internal Voltage Reference Characteristics (1) Symbol Parameter Condition Min Typ Max Units VBG Bandgap reference voltage TBD TBD 1.1 TBD V tBG Bandgap reference start-up time TBD 40 70 µs IBG Bandgap reference current consumption TBD 10 TBD µA |
同様の部品番号 - ATMEGA1281V |
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同様の説明 - ATMEGA1281V |
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