M16CSLASH29 datasheet(254/499 Pages) RENESAS

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15. A/D Converter

page 230

15.1.2 Repeat mode

In repeat mode, analog voltage applied to a selected pin is repeatedly converted to a digital code. Table

15.4

shows the repeat mode specifications. Figure 15.8 shows the operation example in repeat mode.

Figure 15.9

shows the ADCON0 to ADCON2 registers in repeat mode.

Item

Specification

Function

Bits CH2 to CH0 in the ADCON0 register and the ADGSEL1 to ADGSEL0 bits

in the ADCON2 register select pins. Analog voltage applied to a selected pin

is repeatedly converted to a digital code

A/D Conversion Start

• When the TRG bit in the ADCON0 register is 0 (software trigger)

Condition

Set the ADST bit in the ADCON0 register to 1 (A/D conversion started)

• When the TRG bit in the ADCON0 register is 1 (hardware trigger)

The ADTRG pin input changes state from “H” to “L” after setting the ADST bit

to 1 (A/D conversion started)

A/D Conversion Stop Condition Set the ADST bit to 0 (A/D conversion halted)

Interrupt Request Generation Timing None generated

Analog Input Pin

Select one pin from AN0 to AN7, AN00 to AN07, AN20 to AN27, and AN30 to AN32

Readout of A/D Conversion Result Readout one of the AD0 to AD7 registers that corresponds to the selected pin

Table 15.4 Repeat Mode Specifications

Figure 15.8 Operation Example in Repeat Mode

•Example when selecting AN2 to an analog input pin (Ch2 to CH0 = 0102)

A/D conversion started

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

A/D pin input voltage

sampling

A/D pin conversion

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