M16CSLASH29 datasheet(252/499 Pages) RENESAS

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15. A/D Converter

page 228

15.1 Operating Modes

15.1.1 One-Shot Mode

In one-shot mode, analog voltage applied to a selected pin is once converted to a digital code. Table

15.3

shows the one-shot mode specifications. Figure 15.6 shows the operation example in one-shot

mode. Figure 15.7 shows registers ADCON0 to ADCON2 in one-shot mode.

Table 15.3 One-shot Mode Specifications

Item

Specification

Function

Bits CH2 to CH0 in the ADCON0 register and registers ADGSEL1 and

ADGSEL0 in the ADCON2 register select pins. Analog voltage applied to a

selected pin is once 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

• A/D conversion completed (If a software trigger is selected, the ADST bit is

Condition

set to 0 (A/D conversion halted)).

• Set the ADST bit to 0

Interrupt Request Generation Timing A/D conversion completed

Analog Input Pin

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

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

Figure 15.6 Operation Example in One-Shot Mode

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

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

A/D conversion started

A/D interrupt request generated

A/D pin input voltage

sampling

A/D pin conversion

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