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型號(hào)：	MD83C154TXXX-16P883D
廠商：	TEMIC SEMICONDUCTORS
元件分類(lèi)：	微控制器/微處理器
英文描述：	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40
文件頁(yè)數(shù)：	105/839頁(yè)
文件大?。?/td>	61013K
代理商：	MD83C154TXXX-16P883D

ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]

8285E–AVR–02/2013

Figure 23-1. Analog to Digital Converter block schematic.

Operation

The ADC converts an analog input voltage to a 10-bit digital value through successive approximation. The mini-

mum value represents GND and the maximum value represents the voltage on the AREF pin minus 1 LSB.

Optionally, AVCC or an internal 1.1V reference voltage may be connected to the AREF pin by writing to the REFSn

bits in the ADMUX Register. The internal voltage reference may thus be decoupled by an external capacitor at the

AREF pin to improve noise immunity.

The analog input channel is selected by writing to the MUX bits in ADMUX. Any of the ADC input pins, as well as

GND and a fixed bandgap voltage reference, can be selected as single ended inputs to the ADC. The ADC is

enabled by setting the ADC Enable bit, ADEN in ADCSRA. Voltage reference and input channel selections will not

go into effect until ADEN is set. The ADC does not consume power when ADEN is cleared, so it is recommended

to switch off the ADC before entering power saving sleep modes.

The ADC generates a 10-bit result which is presented in the ADC Data Registers, ADCH and ADCL. By default,

the result is presented right adjusted, but can optionally be presented left adjusted by setting the ADLAR bit in

If the result is left adjusted and no more than 8-bit precision is required, it is sufficient to read ADCH. Otherwise,

ADCL must be read first, then ADCH, to ensure that the content of the Data Registers belongs to the same conver-

sion. Once ADCL is read, ADC access to Data Registers is blocked. This means that if ADCL has been read, and

ADC CONVERSION

COMPLETE IRQ

8-BIT DATA BUS

ADC MULTIPLEXER

SELECT (ADMUX)

ADC CTRL. & STATUS

ADC DATA REGISTER

CONVERSION LOGIC

SAMPLE & HOLD

ADC MULTIPLEXER

DIFFERENTIAL

SINGLE ENDED / DIFFERENTIAL SELECTION

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