P89LPC904 datasheet(14/41 Pages) PHILIPS

Part #	P89LPC904

Description	8-bit microcontrollers with two-clock accelerated 80C51 core 1 kB 3 V byte-erasable Flash with 8-bit A/D converter

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

P89LPC904

8-bit microcontrollers with two-clock accelerated 80C51 core

Preliminary data

Rev. 02 — 25 June 2004

14 of 41

9397 750 13521

8.5 External clock input option

In this conﬁguration, the processor clock is derived from an external source driving

the P0.5/CMPREF/CLKIN pin. The rate may be from 0 Hz up to 12 MHz. The

P0.5/CMPREF/CLKIN pin may also be used as a standard port pin.

Fig 4.

Block diagram of oscillator control.

÷2

002aaa782

RTC

CPU

WDT

DIVM

CCLK

OSCCLK

PCLK

TIMERS 0 & 1

WATCHDOG

OSCILLATOR

RC

OSCILLATOR

(7.3728 MHz)

(400 kHz)

BAUD RATE

GENERATOR

UART

clkin

ADC1/

DAC1

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NXP Semiconductors	P89LPC9107	257Kb / 58P	8-bit microcontrollers with two-clock accelerated 80C51 core 1 kB 3 V byte-erasable Flash with 8-bit A/D converter Rev. 02-11 April 2005
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P89LPC904 Datasheet(PDF) 14 Page - NXP Semiconductors

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