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ATMEGA8515-16AU Datasheet(PDF) 49 Page - ATMEL Corporation |
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ATMEGA8515-16AU Datasheet(HTML) 49 Page - ATMEL Corporation |
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49 / 254 page  49 ATmega8515(L) 2512G–AVR–03/05 Internal Voltage Reference ATmega8515 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. 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 19. 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). Thus, when the BOD is not enabled, after setting the ACBG bit, the user must always allow the reference to start up before the output from the Analog Comparator is used. To reduce power consumption in Power-down mode, the user can avoid the two conditions above to ensure that the reference is turned off before entering Power-down mode. Watchdog Timer The Watchdog Timer is clocked from a separate On-chip Oscillator which runs at 1 MHz. This is the typical frequency at V CC = 5V. See characterization data for typical values at other V CC levels. By controlling the Watchdog Timer prescaler, the Watchdog Reset interval can be adjusted as shown in Table 21 on page 51. The WDR – Watchdog Reset – instruction resets the Watchdog Timer. The Watchdog Timer is also reset when it is disabled and when a Chip Reset occurs. Eight different clock cycle periods can be selected to determine the reset period. If the reset period expires without another Watchdog Reset, the ATmega8515 resets and executes from the Reset Vector. For tim- ing details on the Watchdog Reset, refer to page 48. To prevent unintentional disabling of the Watchdog or unintentional change of time-out period, three different safety levels are selected by the Fuses S8515C and WDTON as shown in Table 20. Safety level 0 corresponds to the setting in AT90S4414/8515. There is no restriction on enabling the WDT in any of the safety levels. Refer to “Timed Sequences for Changing the Configuration of the Watchdog Timer” on page 52 for details. Table 19. Internal Voltage Reference Characteristics Symbol Parameter Min Typ Max Units VBG Bandgap reference voltage 1.15 1.23 1.35 V tBG Bandgap reference start-up time 40 70 µs IBG Bandgap reference current consumption 10 µA |
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