PCIF0 datasheet(220/294 Pages) ATMEL

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9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

18.11.4

ADCSRB – ADC Control and Status Register B

• Bit 7– BIN: Bipolar Input Mode

The gain stage is working in the unipolar mode as default, but the bipolar mode can be

selected by writing the BIN bit in the ADCSRB register. In the unipolar mode only one-sided

conversions are supported and the voltage on the positive input must always be larger than

the voltage on the negative input. Otherwise the result is saturated to the voltage reference. In

the bipolar mode two-sided conversions are supported and the result is represented in the

two’s complement form. In the unipolar mode the resolution is 10 bits and the bipolar mode the

resolution is 9bits + 1 sign bit.

• Bit 3 – Res: Reserved Bit

This bit is reserved for future use. For compatibility with future devices it must be written to

zero when ADCSRB register is written.

• Bits 2:0 – ADTS2:0: ADC Auto Trigger Source

If ADATE in ADCSRA register is written to one, the value of these bits selects which source

will trigger an ADC conversion. If ADATE is cleared, the ADTS2:0 settings will have no effect.

A conversion will be triggered by the rising edge of the selected Interrupt Flag. Note that

switching from a trigger source that is cleared to a trigger source that is set, will generate a

positive edge on the trigger signal. If ADEN in ADCSRA register is set, this will start a conver-

sion. Switching to Free Running mode (ADTS[2:0]=0) will not cause a trigger event, even if the

ADC Interrupt Flag is set.

18.11.5

DIDR0 – Digital Input Disable Register 0

Bit

43210

BIN

ACME

ACIR1

ACIR0

–

ADTS2

ADTS1

ADTS0

ADCSRB

Read/Write

R/W

Initial Value

00000

Table 18-7.

ADC Auto Trigger Source Selections

ADTS2

ADTS1

ADTS0

Trigger Source

Free Running mode

Analog Comparator

External Interrupt Request 0

Timer/Counter1 Compare Match A

Timer/Counter1 Overflow

Timer/Counter1 Compare Match B

Timer/Counter1 Capture Event

Watchdog Interrupt Request

Bit

543210

ADC7D /

AIN1D

ADC6D /

AIN0D

ADC5D

ADC4D

ADC3D

ADC2D

ADC1D

ADC0D

DIDR0

Read/Write

R/W

Initial Value

000000

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