R28 datasheet(351/473 Pages) RENESAS

351 / 473 page

R8C/28 Group, R8C/29 Group

18. A/D Converter

Rev.2.10

Sep 26, 2008

Page 332 of 441

REJ09B0279-0210

18.1

One-Shot Mode

In one-shot mode, the input voltage of one selected pin is A/D converted once.

Table 18.2 lists the Specifications of One-Shot Mode. Figure 18.4 shows the ADCON0 Register in One-Shot Mode

and Figure 18.5 shows the ADCON1 Register in One-Shot Mode.

Figure 18.4

ADCON0 Register in One-Shot Mode

Table 18.2

Specifications of One-Shot Mode

Item

Specification

Function

The input voltage of one pin selected by bits CH2 to CH0 is A/D converted

once

Start condition

Set the ADST bit to 1 (A/D conversion starts)

Stop condition

• A/D conversion completes (ADST bit is set to 0)

• Set the ADST bit to 0

Interrupt request

generation timing

A/D conversion completes

Input pin

Select one of AN8 to AN11

Reading of A/D conversion

result

Read AD register

A/D Control Register 0

(1)

Symbol

Address

After Reset

ADCON0

00D6h

00h

Bit Symbol

Bit Name

Function

NOTES:

When changing A/D operation mode, set the analog input pin again.

Set øAD frequency to 10 MHz or below .

CKS0

Frequency select bit 0

[When CKS1 in ADCON1 register = 0]

0 : Selects f4

1 : Selects f2

[When CKS1 in ADCON1 register = 1]

0 : Selects f1(4)

1 : Selects fOCO-F

If the ADCON0 register is rew ritten during A/D conversion, the conversion result is undefined.

Bits CH0 to CH2 are enabled w hen the ADGSEL0 bit is set to 1. Write to bits CH0 to CH2 after setting the ADGSEL0 bit

to 1.

ADST

A/D conversion start flag

0 : Stops A/D conversion

1 : Starts A/D conversion

—

(b5)

Reserved bit

Set to 0.

0 : One-shot mode

ADGSEL0

A/D input group select bit

0 : Disabled

1 : Enabled (AN8 to AN11)

CH1

CH0

CH2

Analog input pin select

bits(2)

b2 b1 b0

1 0 0 : AN8

1 0 1 : AN9

1 1 0 : AN10

1 1 1 : AN11

Other than above : Do not set.

A/D operating mode select

bit(3)

b7 b6 b5 b4

01 0

b3 b2 b1 b0

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