Specifications

dsPIC33F Family Reference Manual

16.11 HOW TO STOP SAMPLING AND START CONVERSIONS

The conversion trigger source terminates sampling and starts a selected sequence of

conversions. The Sample Clock Source Select (SSRC<2:0>) bits (ADxCON1<7:5>) select the

source of the conversion trigger.

16.11.1 Manual

When SSRC<2:0> = 000, the conversion trigger is under software control. Clearing the SAMP

bit (ADxCON1<1>) starts the conversion sequence.

Figure 16-5 is an example where setting the SAMP bit initiates sampling and clearing the SAMP

bit terminates sampling and starts conversion. The user software must time the setting and

clearing of the SAMP bit to ensure adequate sampling time of the input signal. See Example 16-1

for code example.

Figure 16-5: Converting 1 Channel, Manual Sample Start, Manual Conversion Start

Note: The available conversion trigger sources can vary depending on the device variant.

Please refer to the specific device data sheet for the available conversion trigger

sources.

Note: The SSRC<2:0> selection bits should not be changed when the ADC module is

enabled. If you change the conversion trigger source, be sure the ADC module is

disabled first by clearing the ADON bit (ADxCON1<15>).

ADC Clock

SAMP

ADC1BUF0

TSAMP

TCONV

BCLR AD1CON1,SAMPBSET AD1CON1,SAMP

Instruction Execution

DONE