Rainbow-electronics ATmega64M1 Manual de usuario descargar pdf (Pagina 237)

100

101

237

8209A–AVR–08/09

ATmega16M1/32M1/64M1

(ADC9 in ADCH). If the bit is one, the result is negative, and if this bit is zero, the result is posi-

tive. Figure 22-14 shows the decoding of the differential input range.

Table 22-2 shows the resulting output codes if the differential input channel pair (ADCn - ADCm)

is selected with a reference voltage of V

REF

Figure 22-14. Differential Measurement Range

Table 22-2. Correlation Between Input Voltage and Output Codes

ADCn

Read code Corresponding decimal value

ADCm

+ V

REF

/GAIN 0x1FF 511

ADCm

+ 0.999 V

REF

/GAIN 0x1FF 511

ADCm

+ 0.998 V

REF

/GAIN 0x1FE 510

... ... ...

ADCm

+ 0.001 V

REF

/GAIN 0x001 1

ADCm

0x000 0

ADCm

- 0.001 V

REF

/GAIN 0x3FF -1

... ... ...

ADCm

- 0.999 V

REF

/GAIN 0x201 -511

ADCm

- V

REF

/GAIN 0x200 -512

Output Code

0x1FF

0x000

REF

Differential Input

Voltage (Volts)

0x3FF

0x200

- V

REF

/Gain

1 2 ... 232 233 234 235 236 237 238 239 240 241 242 ... 342 343

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