P89LPC9211FDH datasheet(40/75 Pages) NXP

40 / 75 page

P89LPC92X1

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Product data sheet

Rev. 2 — 1 December 2010

40 of 75

NXP Semiconductors

P89LPC9201/9211/922A1/9241/

8-bit microcontroller with 8-bit ADC

7.24 Analog comparators

Two analog comparators are provided on the P89LPC9201/9211/922A1/9241/9251. Input

and output options allow use of the comparators in a number of different configurations.

Comparator operation is such that the output is a logical one (which may be read in a

greater than the negative input (selectable from a pin or an internal reference voltage).

Otherwise the output is a zero. Each comparator may be configured to cause an interrupt

when the output value changes.

Fig 12. I2C-bus serial interface block diagram

002aaa899

ADDRESS REGISTER

COMPARATOR

SHIFT REGISTER

I2ADR

ACK

BIT COUNTER /

ARBITRATION

AND SYNC LOGIC

I2DAT

TIMING

AND

CONTROL

LOGIC

SERIAL CLOCK

GENERATOR

CCLK

interrupt

INPUT

FILTER

OUTPUT

STAGE

INPUT

FILTER

OUTPUT

STAGE

P1.3

P1.3/SDA

P1.2/SCL

P1.2

timer 1

overflow

CONTROL REGISTERS AND

SCL DUTY CYCLE REGISTERS

I2CON

I2SCLH

I2SCLL

STATUS

DECODER

status bus

STATUS REGISTER

I2STAT

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