ATmega16 datasheet(195/315 Pages) ATMEL

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195

ATmega16(L)

2466E–AVR–10/02

Analog Comparator

The Analog Comparator compares the input values on the positive pin AIN0 and nega-

tive pin AIN1. When the voltage on the positive pin AIN0 is higher than the voltage on

the negative pin AIN1, the Analog Comparator Output, ACO, is set. The comparator’s

output can be set to trigger the Timer/Counter1 Input Capture function. In addition, 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 dia-

gram of the comparator and its surrounding logic is shown in Figure 97.

Figure 97. Analog Comparator Block Diagram

(2)

Notes:

1. See Table 79 on page 197.

2. Refer to Figure 1 on page 2 and Table 25 on page 55 for Analog Comparator pin

placement.

Special Function IO Register –

SFIOR

• Bit 3 – 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 negative input to the Analog Comparator. When

this bit is written logic zero, AIN1 is applied to the negative input of the Analog Compar-

ator. For a detailed description of this bit, see “Analog Comparator Multiplexed Input” on

page 197.

Analog Comparator Control

and Status Register – ACSR

ACBG

BANDGAP

REFERENCE

ADC MULTIPLEXER

OUTPUT

ACME

ADEN

(1)

Bit

ADTS2

ADTS1

ADTS0

ADHSM

ACME

PUD

PSR2

PSR10

SFIOR

Read/Write

R/W

Initial Value

Bit

765

432

ACD

ACBG

ACO

ACI

ACIE

ACIC

ACIS1

ACIS0

ACSR

Read/Write

R/W

Initial Value

N/A

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