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ATmega644PA 데이터시트(PDF) 55 Page - ATMEL Corporation

부품명 ATmega644PA
상세설명  8-bit Microcontroller with 16/32/64/128K Bytes In-Sytem Programmable Flash
PDF  468 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega644PA 데이터시트(HTML) 55 Page - ATMEL Corporation

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8152G–AVR–11/09
ATmega164PA/324PA/644PA/1284P
10.2
Internal Voltage Reference
ATmega164PA/324PA/644PA/1284P 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.
10.2.1
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 334. 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 Comparator 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.



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