P89LPC922A1FDH datasheet(49/75 Pages) NXP

49 / 75 page

P89LPC92X1

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Product data sheet

Rev. 2 — 1 December 2010

49 of 75

NXP Semiconductors

P89LPC9201/9211/922A1/9241/

8-bit microcontroller with 8-bit ADC

8.5.3 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.

8.5.4 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

terminated by the user.

8.5.5 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

the 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).

8.5.6 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.

8.6 Conversion start modes

8.6.1 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 ADC operating modes.

8.6.2 Start immediately

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

ADC operating modes.

8.6.3 Edge triggered

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 ADC operating modes.

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