STV3550 datasheet(95/144 Pages) STMICROELECTRONICS

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Conversions can be started by software or by a falling edge on the external trigger pin.

End of Conversion Interrupt

An interrupt can be generated at the end of each conversion.

Analog Watchdog Interrupt

Moreover, another interrupt can be generated based on the upper or lower threshold limits of the

watchdog. See Section 7.6.4.

7.6.3.1 1-Channel mode

Only the selected analog input is converted. At the end of this conversion, the overflow status and

result are stored in the control registers of the selected channel.

7.6.3.2 Scan Mode

Up to 6 channels can be sequentially converted starting with Channel 0 and ending with Channel 7.

At the end of the conversion of each channel, the overflow status and result are stored in the control

7.6.3.3 Single / Continuous Mode

Each main mode can run in either Single or Continuous mode.

In Single mode, the conversion sequence for the analog channel input is performed one single time.

In Continuous mode, the conversion sequence is performed continuously until reset by software.

7.6.4

Analog Watchdog

The Analog Watchdog is used to generate an interrupt based on two programmable threshold

levels.

For each channel, when the level of the analog input exceeds upper and lower threshold values, an

interrupt is generated.

Figure 60: A/D Converter Trigger Source

Int. Trigger Enable

On-chip Event

Start Group of Conversions

Continuous or Single Mode

Software Trigger

Ext. Trigger Enable

ADC Trigger

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