Rainbow-electronics ATmega64M1 Manuel d'utilisateur télécharger pdf (Page 248)

248

8209A–AVR–08/09

ATmega16M1/32M1/64M1

Consequently, in 10-bit configuration, the ADCL register must be read first before the ADCH.

Nevertheless, to work easily with only 8-bit precision, there is the possibility to left adjust the

result thanks to the ADLAR bit in the ADCSRA register. Like this, it is sufficient to only read

ADCH to have the conversion result.

22.10.5.1 ADLAR = 0

22.10.5.2 ADLAR = 1

22.10.6 DIDR0 – Digital Input Disable Register 0

• Bit 7:0 – ADC7D..ADC0D, ACMPN0D, ACMPN1D, ACMPN2D, ACMPN3D, ACMP2D,

AMP2ND:

ADC7:0, ACMPN0, ACMPN1, ACMPN2, ACMPN3, ACMP2, AMP2N Digital Input Disable

When this bit is written logic one, the digital input buffer on the corresponding ADC pin is dis-

abled. The corresponding PIN Register bit will always read as zero when this bit is set. When an

analog signal is applied to the ADC7:0 pin and the digital input from this pin is not needed, this

bit should be written logic one to reduce power consumption in the digital input buffer.

22.10.7 DIDR1 – Digital Input Disable Register 1

Bit 76543210

- - - - - - ADC9 ADC8 ADCH

ADC7 ADC6 ADC5 ADC4 ADC3 ADC2 ADC1 ADC0 ADCL

Read/Write RRRRRRRR

RRRRRRRR

Initial Value 0 0 0 0 0 0 0 0

00000000

Bit 76543210

ADC9 ADC8 ADC7 ADC6 ADC5 ADC4 ADC3 ADC2 ADCH

ADC1 ADC0 - - - - - - ADCL

Read/Write RRRRRRRR

RRRRRRRR

Initial Value 0 0 0 0 0 0 0 0

00000000

Bit 76543210

ADC7D ADC6D

ACMPN1D

AMP2ND

ADC5D

ACMPN0D

ADC4D ADC3D

ACMPN2D

ADC2D

ACMP2D

ADC1D ADC0D

ACMPN3D

DIDR0

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value 00000000

Bit 76543210

- AMP2PD ACMP0D AMP0PD AMP0ND ADC10D

ACMP1D

ADC9D

AMP1PD

ACMP3D

ADC8D

AMP1ND

DIDR1

Read/Write - - R/W R/W R/W R/W R/W R/W

Initial Value 00000000

1 2 ... 243 244 245 246 247 248 249 250 251 252 253 ... 342 343

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Rainbow-electronics ATmega64M1 Manuel d'utilisateur Page 248

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