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型號(hào)：	MQ80C32-12SBD
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, 12 MHz, MICROCONTROLLER, CQFP44
文件頁(yè)數(shù)：	400/604頁(yè)
文件大小：	22337K
代理商：	MQ80C32-12SBD

42073A-MCU Wireless-02/13

ATmega2564/1284/644RFR2

run_cmd, (1<<ADEN)+(1<<ADSC)+(4<<ADPS0)

run_conversion:

ADCSRA, run_cmd

sbrc r17, ADSC

; flag cleared at conversion complete

rjmp wait_adsc

; measured temperature in ADCL and ADCH

The above Assembly code example enables the temperature measurement step by

step. Waiting for AVDDOK and REFOK is optional. The conversion will not start before

the two bits are set. The wait time can be extended if necessary or choose a longer

start-up time. An 8 MHz CPU clock is assumed.

C Code Example

uint16_t adc_meastemp (void)

ADCSRC = 10<<ADSUT0;

// set start-up time

ADCSRB = 1<<MUX5;

// set MUX5 first

= (3<<REFS0) + (9<<MUX0);

// store new ADMUX, 1.6V AREF

// switch ADC on, set prescaler, start conversion

ADCSRA = (1<<ADEN) + (1<<ADSC) + (4<<ADPS0);

{} while( (ADCSRA & (1<<ADSC))); // wait for conversion end

// disable the ADC

return (ADC);

The C Code Example fully relies on the integrated start-up mechanism of the A/D

converter. The accuracy can be increased by averaging and/or oversampling. In

addition a dummy conversion can be inserted before the first temperature measurement

is assessed.

The A/D conversion result ADCTEMP will always be a positive number. The ideal result

can be calculated when using the internal 1.6V reference voltage according to the

following equation:

Similar the Celsius-temperature θ can be extracted from the A/D conversion result with

this formula:

Note that the above equations are only valid in the allowed operating temperature

range. The translation of the A/D measurement result to a Celsius-temperature value

can be easily achieved with a look-up table in software. The temperature sensor is

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