Rainbow-electronics ATmega128RFA1 Manual de usuario descargar pdf (Pagina 433)

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8266A-MCU Wireless-12/09

ATmega128RFA1

• ADC9:0: A/D Conversion Result

These bits represent the result from the conversion as detailed in "ADC Conversion

Result" on page 423.

27.11.6 DIDR0 – Digital Input Disable Register 0

Bit 7 6 5 4 3 2 1 0

NA ($7E) ADC7D ADC6D ADC5D ADC4D ADC3D ADC2D ADC1D ADC0D DIDR0

Read/Write RW RW RW RW RW RW RW RW

Initial Value 0 0 0 0 0 0 0 0

• Bits 7:0 – ADC7D:ADC0D: Digital Input Disable

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

is disabled. 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.

27.11.7 DIDR2 – Digital Input Disable Register 2

Bit 7 6 5 4 3 2 1 0

NA ($7D) ADC15D

ADC14D

ADC13D

ADC12D

ADC11D

ADC10D

ADC9D ADC8D DIDR2

Read/Write RW RW RW RW RW RW RW RW

Initial Value 0 0 0 0 0 0 0 0

Reserved for future use.

• Bit 7:0 – ADC15D:ADC8D - Reserved Bits

This bit is reserved for future use. For ensuring compatibility with future devices, this bit

must be written to zero.

27.11.8 BGCR – Reference Voltage Calibration Register

Bit 7 6 5 4

NA ($67) Res BGCAL_FINE3 BGCAL_FINE2 BGCAL_FINE1 BGCR

Read/Write R RW RW RW

Initial Value 0 0 0 0

Bit 3 2 1 0

NA ($67) BGCAL_FINE0 BGCAL2 BGCAL1 BGCAL0 BGCR

Read/Write RW RW RW RW

Initial Value 0 0 0 0

This register contains the calibration values of the reference voltage of the ADC. The

values are loaded from the fuse memory after power-up. They can be corrected by the

application software e.g. to compensate for temperature changes. The internal 1.6V

reference voltage is calibrated and has therefore the highest accuracy compared to the

1.5V or AVDD reference.

• Bit 7 – Res - Reserved Bit

This bit is reserved for future use. A read access always will return zero. A write access

does not modify the content.

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