P89LPC933FDH datasheet(54/75 Pages) PHILIPS

54 / 75 page

9397 750 15113

Product data sheet

Rev. 06 — 20 June 2005

54 of 75

Philips Semiconductors

P89LPC933/934/935/936

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

9.4.2 Fixed channel, continuous conversion mode

A single input channel can be selected for continuous conversion. The results of the

conversions will be sequentially placed in the four result registers. An interrupt, if enabled,

will be generated after every four conversions. Additional conversion results will again

cycle through the four result registers, overwriting the previous results. Continuous

conversions continue until terminated by the user.

9.4.3 Auto scan, single conversion mode

Any combination of the four input channels can be selected for conversion. A single

conversion of each selected input will be performed and the result placed in the result

generated after all selected channels have been converted. If only a single channel is

selected this is equivalent to single channel, single conversion mode.

9.4.4 Auto scan, continuous conversion mode

Any combination of the four input channels can be selected for conversion. A conversion

of each selected input will be performed and the result placed in the result register which

corresponds to the selected input channel. An interrupt, if enabled, will be generated after

all selected 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.

9.4.5 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, ADxDAT0. The result of the conversion of the second channel is placed in

result register, ADxDAT1. The ﬁrst channel is again converted and its result stored in

ADxDAT2. The second channel is again converted and its result placed in ADxDAT3. An

interrupt is generated, if enabled, after every set of four conversions (two conversions per

channel).

9.4.6 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.

9.5 Conversion start modes

9.5.1 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.

9.5.2 Start immediately

Programming this mode immediately starts a conversion.This start mode is available in all

A/D operating modes.

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