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P89LPC9408 データシート(PDF) 29 Page - NXP Semiconductors |
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P89LPC9408 データシート(HTML) 29 Page - NXP Semiconductors |
29 / 69 page P89LPC9408_1 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 01 — 16 December 2005 29 of 69 Philips Semiconductors P89LPC9408 8-bit two-clock 80C51 core with 32 segment × 4 LCD driver, 10-bit ADC 7.17.1 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. 7.17.2 Mode 1 Mode 1 is the same as Mode 0, except that all 16 bits of the timer register are used. 7.17.3 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. 7.17.4 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. 7.17.5 Mode 6 In this mode, the corresponding timer can be changed to a PWM with a full period of 256 timer clocks. 7.17.6 Timer overflow toggle output Timers 0 and 1 can be configured to automatically toggle a port output whenever a timer overflow occurs. The same device pins that are used for the T0 and T1 count inputs are also used for the timer toggle outputs. The port outputs will be a logic 1 prior to the first timer overflow when this mode is turned on. 7.18 RTC/system timer The P89LPC9408 has a simple RTC that allows a user to continue running an accurate timer while the rest of the device is powered-down. The RTC can be a wake-up or an interrupt source. The RTC is a 23-bit down counter comprised of a 7-bit prescaler and a 16-bit loadable down counter. When it reaches all logic 0s, the counter will be reloaded again and the RTCF flag will be set. The clock source for this counter can be either the CPU clock (CCLK) or the XTAL oscillator, provided that the XTAL oscillator is not being used as the CPU clock. If the XTAL oscillator is used as the CPU clock, then the RTC will use CCLK as its clock source. Only power-on reset will reset the RTC and its associated SFRs to the default state. 7.19 CCU This unit features: • A 16-bit timer with 16-bit reload on overflow. • Selectable clock, with prescaler to divide clock source by any integral number between 1 and 1024. • Four compare/PWM outputs with selectable polarity • Symmetrical/asymmetrical PWM selection • Two capture inputs with event counter and digital noise rejection filter |
同様の部品番号 - P89LPC9408 |
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同様の説明 - P89LPC9408 |
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