PCINT13 datasheet(222/294 Pages) ATMEL

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222

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

19. AnaComp - Analog Comparator

The Analog Comparator compares the input values on the positive pin (AIN1) and negative pin

(AIN0). When the voltage on the positive pin is higher than the voltage on the negative pin, the

Analog Comparator output, ACO, is set. The comparator can trigger a separate interrupt,

exclusive to the Analog Comparator. The user can select Interrupt triggering on comparator

output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is shown

in Figure 19-1.

Figure 19-1. Analog Comparator Block Diagram

(1)(2)

Notes:

1. See Table 19-2 on page 225 and Table 19-3 on page 225

2. Refer to Figure 1-5 on page 6 and Table 9-3 on page 79 for Analog Comparator pin

placement.

19.1

19.1.1

ADC Control and Status Register B – ADCSRB

• Bit 6 – ACME: Analog Comparator Multiplexer Enable

When this bit is written logic one and the ADC is switched off (ADEN in ADCSRA is zero), the

ADC multiplexer selects the positive input to the Analog Comparator. When this bit is written

logic zero, AIN1 is applied to the positive input of the Analog Comparator.

When the Analog to Digital Converter (ADC) is configured as single ended input channel, it is

possible to select any of the ADC[10..0] pins to replace the positive input to the Analog Com-

parator. The ADC multiplexer (MUX[4..0]) is used to select this input, and consequently, the

ADC must be switched off to utilize this feature.

Analog Comparator

Interrupt

Sensivity

Control

ACO

ACI

ACIE

ACIS0

ACIS1

ACME

ACIRS

ADEN

16-bit Timer/Counter

Input Capture

AIN0

(PA6)

AIN1

(PA7)

REFS1

Internal

2.56 V

Reference

ACIR1

ACIR0

2.56 V

1.28 V

0.64 V

0.32 V

ACD

AVcc

(from ADC)

REFS0

(1)

ADC Multiplexer

Output

Bit

654321

BIN

ACME

ACIR1

ACIR0

—

ADTS2

ADTS1

ADTS0

ADCSRB

Read/Write

R/W

Initial Value

000000

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