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P89LPC916 Datasheet(PDF) 34 Page - NXP Semiconductors |
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P89LPC916 Datasheet(HTML) 34 Page - NXP Semiconductors |
34 / 72 page Philips Semiconductors P89LPC915/916/917 8-bit microcontrollers with accelerated two-clock 80C51 core Product data Rev. 04 — 17 December 2004 34 of 72 9397 750 14397 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. channels have been converted. The process will repeat starting with the first selected channel. Additional conversion results will again cycle through the four result registers, overwriting the previous results. Continous conversions continue until terminated by the user. Dual channel, continuous conversion mode: This is a variation of the auto scan continuous conversion mode where conversion occurs on two user-selectable inputs. The result of the conversion of the first channel is placed in result register, AD1DAT0. The result of the conversion of the second channel is placed in result register, AD1DAT1. The first channel is again converted and its result stored in AD1DAT2. The second channel is again converted and its result placed in AD1DAT3. An interrupt is generated, if enabled, after every set of four conversions (two conversions per channel). Single step mode: This special mode allows ‘single-stepping’ in an auto scan conversion mode. Any combination of the four input channels can be selected for conversion. After each channel is converted, an interrupt is generated, if enabled, and the A/D waits for the next start condition. May be used with any of the start modes. 9.9.4 Conversion start modes Timer triggered start: An A/D conversion is started by the overflow of Timer 0. Once a conversion has started, additional Timer 0 triggers are ignored until the conversion has completed. The Timer triggered start mode is available in all A/D operating modes. Start immediately: Programming this mode immediately starts a conversion. This start mode is available in all A/D operating modes. Edge triggered: (P89LPC915/917) An A/D conversion is started by rising or falling edge of P1.4. Once a conversion has started, additional edge triggers are ignored until the conversion has completed. The edge triggered start mode is available in all A/D operating modes. |
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