AT89LP6440 datasheet(126/194 Pages) ATMEL

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126

3706A–MICRO–9/09

AT89LP6440 - Preliminary

Figure 18-15. Combining Several TWI Modes to Access a Serial EEPROM

19. Dual Analog Comparators

The AT89LP6440 provides two analog comparators. The analog comparators have the following

features:

• Internal 3-level Voltage Reference (1.125V, 1.25V, 1.375V)

•Four Shared Analog Input Channels

– Configure as Multiple Input Window Comparator

• Selectable Interrupt Conditions

– High- or Low-level

–Rising- or Falling-edge

–Output Toggle

•Hardware Debouncing Modes

Figure 19-1. Dual Comparator Block Diagram

A block diagram of the dual analog comparators with relevant connections is shown in Figure

19-1. Input options allow the comparators to function in a number of different configurations as

shown in Figure 19-4. Comparator operation is such that the output is a logic “1” when the posi-

tive input is greater than the negative input. Otherwise the output is a zero. Setting the CENA

(ACSRA.3) and CENB (ACSRB.3) bits enable Comparator A and B respectively. The user must

Master Transmitter

Master Receiver

S = START

Rs = REPEATED START

P = STOP

Transmitted from master to slave

Transmitted from slave to master

SLA+W

ADDRESS

SLA+R

DATA

(P2.5) AIN1

(P2.6) AIN2

(P2.4) AIN0

(P2.7) AIN3

RFB1

RFB0

RFA1

RFA0

CSB0

CSB1

CSA0

CSA1

CMPB (P4.7)

CMPA (P4.6)

CMB0

CMB1

CMB2

CMA0

CMA1

CMA2

CFB

CFA

Interrupt

VAREF

VAREF-Δ

VAREF+Δ

AT89LP6440 Datasheet(PDF) 126 Page - ATMEL Corporation

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