R28 datasheet(353/473 Pages) RENESAS

353 / 473 page

R8C/28 Group, R8C/29 Group

18. A/D Converter

Rev.2.10

Sep 26, 2008

Page 334 of 441

REJ09B0279-0210

18.2

Repeat Mode

In repeat mode, the input voltage of one selected pin is A/D converted repeatedly.

Table 18.3 lists the Specifications of Repeat Mode. Figure 18.6 shows the ADCON0 Register in Repeat Mode and

Figure 18.7 shows the ADCON1 Register in Repeat Mode.

Figure 18.6

ADCON0 Register in Repeat Mode

Table 18.3

Specifications of Repeat Mode

Item

Specification

Function

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

repeatedly

Start conditions

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

Stop condition

Set the ADST bit to 0

Interrupt request

generation timing

Not generated

Input pin

Select one of AN8 to AN11

Reading of result of A/D

converter

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 : Do not set.

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.

1 : Repeat 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 1

b3 b2 b1 b0

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