Renesas Laptop 6NM Manual Do Utilizador

Rev.1.10    Jul 01, 2005    page 185 of 318
REJ09B0124-0110

M16C/6N Group (M16C/6NK, M16C/6NM)

15. A/D Converter

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

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 the pin is converted to a

digital code once.

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

• Completion of A/D conversion (If a software trigger is selected, the ADST

Stop Condition

bit is set to “0” (A/D conversion halted).)

• Set the ADST bit to “0”

Interrupt Request

Completion of A/D conversion

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

In one-shot mode, analog voltage applied to a selected pin is A/D converted once. Table 15.2 lists the

specifications of one-shot mode. Figure 15.4 shows the ADCON0 and ADCON1 registers in one-shot mode.