M38K09RFS datasheet(203/328 Pages) RENESAS

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2.7 A/D converter

Rev.2.00

Oct 05, 2006

page 74 of 111

38K0 Group

REJ09B0337-0200

APPLICATION

2.7.3 A/D converter application examples

(1)

Conversion of analog input voltage

Outline : The analog input voltage input from a sensor is converted to digital values.

Figure 2.7.7 shows a connection diagram, and Figure 2.7.8 shows the related registers setting.

Fig. 2.7.7 Connection diagram

Specifications : •The analog input voltage input from a sensor is converted to digital values.

•P10/DQ0/AN0 pin is used as an analog input pin.

Fig. 2.7.8 Related registers setting

P10/DQ0/AN0

38K0 Group

Sensor

AD control register (address 3616)

ADCON

Analog input pin : P10/DQ0/AN0 selected

A/D conversion start

AD conversion register 2 (address 3816)

AD2

AD1

(Read-only)

AD conversion register 1 (address 3716)

(Read-only)

A result of A/D conversion is stored (Note).

Note: After bit 3 of ADCON is set to “1”, read out that contents.

When reading 10-bit data, read address 003816 before address 003716;

when reading 8-bit data, read address 003716 only.

When reading 10-bit data, bits 2 to 6 of address 003816 are “0”.

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