Renesas 16-bit single-chip microcomputer Manual De Usuario

Rev.1.02    Jul 01, 2005    page 183 of 314
REJ09B0126-0102

M16C/6N Group (M16C/6NL, M16C/6NN)

15. A/D Converter

This document is under development and its contents are subject to change.

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

Table 15.3 lists the specifications of repeat mode. Figure 15.5 shows the ADCON0 and ADCON1 registers

in repeat mode.

Item

Specification

Function

The CH2 to CH0 bits in the ADCON0 register, the ADGSEL1 to ADGSEL0

bits in the ADCON2 register and the OPA1 to OPA0 bits in the ADCON1

register select a pin.  Analog voltage applied to this pin is repeatedly

converted to a digital code.

A/D Conversion

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

Start Condition

The ADST bit in the ADCON0 register is set to “1” (A/D conversion starts)

_____________

• When the TRG bit is “1” (ADTRG trigger)

_____________

Input on the ADTRG pin changes state from high to low after the ADST

bit is set to “1” (A/D conversion starts)

A/D Conversion

Set the ADST bit to “0” (A/D conversion halted)

Stop Condition

Interrupt Request

None generated

Generation Timing

Analog Input Pin

Select one pin from AN0 to AN7, AN0_0 to AN0_7, AN2_0 to AN2_7,

ANEX0 to ANEX1

Reading of Result of

Read one of the AD0 to AD7 registers that corresponds to the selected pin

A/D Converter