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P89LPC904 Datasheet(PDF) 14 Page - NXP Semiconductors |
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P89LPC904 Datasheet(HTML) 14 Page - NXP Semiconductors |
14 / 41 page 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 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 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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