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dsPIC33F Family Reference Manual

16.11.3.4 SYNCHRONIZING A/D OPERATIONS TO INTERNAL OR EXTERNAL

EVENTS

Modes where an external event trigger pulse ends sampling and starts conversion (SSRC<2:0>

= 001, 10, 011) can be used in combination with auto-sampling (ASAM = 1) to cause the ADC

module to synchronize the sample conversion events to the trigger pulse source. For example,

in Figure 16-12, where SSRC<2:0> = 010 and ASAM = 1, the ADC module always ends sam-

pling and starts conversions synchronously with the timer compare trigger event. The ADC has

a sample conversion rate that corresponds to the timer comparison event rate.

Figure 16-11: Converting One Channel, Manual Sample Start, Conversion Trigger Based Conversion Start

Figure 16-12: Converting One Channel, Auto-Sample Start, Conversion Trigger Based Conversion Start

Conversion

ADCLK

SAMP

ADC1BUF0

TSAMP

TCONV

BSET AD1CON1,SAMP

Instruction Execution

Trigger

ADCLK

SAMP

Buffer[0]

TSAMP

TCONV

BSET AD1CON1,ASAM Instruction Execution

TCONV

TSAMP

Buffer[1]

DONE

Conversion

Trigger

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