ST72561AR7-Auto datasheet(260/324 Pages) STMICROELECTRONICS

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10-bit A/D converter (ADC)

ST72561-Auto

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Doc ID 12370 Rev 8

Figure 117. ADC block diagram

18.3.2

A/D conversion

The analog input ports must be configured as input, no pull-up, no interrupt. Refer to the

Chapter 8: I/O ports. Using these pins as analog inputs does not affect the ability of the port

to be read as a logic input.

In the ADCCSR register:

●

Select the CS[3:0] bits to assign the analog channel to convert.

ADC conversion mode:

In the ADCCSR register:

●

Set the ADON bit to enable the A/D converter and to start the conversion. From this

time on, the ADC performs a continuous conversion of the selected channel.

When a conversion is complete:

●

The EOC bit is set by hardware.

●

The result is in the ADCDR registers.

A read to the ADCDRH resets the EOC bit.

To read the 10 bits, perform the following steps:

Poll EOC bit

Read the ADCDRL register

Read the ADCDRH register. This clears EOC automatically.

To read only 8 bits, perform the following steps:

Poll EOC bit

Read the ADCDRH register. This clears EOC automatically.

CH2

CH1

EOC SPEED ADON SLOW

CH0

ADCCSR

AIN0

AIN1

ANALOG TO DIGITAL

CONVERTER

AINx

ANALOG

MUX

ADCDRH

fADC

fCPU

ADCDRL

CH3

fCPU, fCPU/2, fCPU/4

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