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P89LPC903 Datasheet(PDF) 34 Page - NXP Semiconductors |
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P89LPC903 Datasheet(HTML) 34 Page - NXP Semiconductors |
34 / 55 page Philips Semiconductors P89LPC901/902/903 8-bit microcontrollers with two-clock 80C51 core Product data Rev. 04 — 21 November 2003 34 of 55 9397 750 12293 © Koninklijke Philips Electronics N.V. 2003. All rights reserved. Reset can be triggered from the following sources: • External reset pin (during power-up or if user configured via UCFG1) • Power-on detect • Brownout detect • Watchdog Timer • Software reset • UART break character detect reset (P80LPC903). For every reset source, there is a flag in the Reset Register, RSTSRC. The user can read this register to determine the most recent reset source. These flag bits can be cleared in software by writing a ‘0’ to the corresponding bit. More than one flag bit may be set: • During a power-on reset, both POF and BOF are set but the other flag bits are cleared. • For any other reset, previously set flag bits that have not been cleared will remain set. 8.16 Timers/counters 0 and 1 The P89LPC901/902/903 has two general purpose timers which are similar to the standard 80C51 Timer 0 and Timer 1. These timers have four operating modes (modes 0, 1, 2, and 3). Modes 0, 1, and 2 are the same for both Timers. Mode 3 is different. 8.16.1 Mode 0 Putting either Timer into Mode 0 makes it look like an 8048 Timer, which is an 8-bit Counter with a divide-by-32 prescaler. In this mode, the Timer register is configured as a 13-bit register. Mode 0 operation is the same for Timer 0 and Timer 1. 8.16.2 Mode 1 Mode 1 is the same as Mode 0, except that all 16 bits of the timer register are used. 8.16.3 Mode 2 Mode 2 configures the Timer register as an 8-bit Counter with automatic reload. Mode 2 operation is the same for Timer 0 and Timer 1. 8.16.4 Mode 3 When Timer 1 is in Mode 3 it is stopped. Timer 0 in Mode 3 forms two separate 8-bit counters and is provided for applications that require an extra 8-bit timer. When Timer 1 is in Mode 3 it can still be used by the serial port as a baud rate generator. 8.16.5 Mode 6 (P89LPC901) In this mode, the corresponding timer can be changed to a PWM with a full period of 256 timer clocks. |
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