R8CSLASH15 datasheet(182/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

16. A/D Converter

Rev.2.10

Jan 19, 2006

Page 170 of 253

REJ09B0164-0210

Figure 16.2

ADCON0 and ADCON1 Registers

A/D Control Register 0

(1)

Symbol

Address

After Reset

ADCON0

00D6h

00000XXXb

Bit Symbol

Bit Name

Function

NOTES :

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

Set øAD frequency to 10MHz or below .

CKS0

Frequency Select Bit 0

[When CKS1 in ADCON1 register = 0]

0 : Select f4

1 : Select f2

[When CKS1 in ADCON1 register = 1]

0 : Select f1(4)

1 : Do not set

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

CH0 to CH2 bits are enabled w hen the ADGSEL0 bit is set to “1”. After setting the ADGSEL0 bit to “1”, w rite to the

CH0 to CH2 bits.

ADST

A/D Conversion Start Flag

0 : Disabes A/D conversion

1 : Starts A/D conversion

ADCAP

A/D Conversion Automatic

Start Bit

0 : Starts in softw are trigger (ADST bit)

1 : Starts in capture (Requests Timer Z interrupt)

0 : On-shot mode

1 : Repeat mode

ADGSEL0

A/D Input Group Select Bit

0 : Disabled

1 : Enabled (AN8 to AN11)

CH1

CH0

CH2

Analog Input Pin Select

Bit(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 Operation Mode Select

Bit(3)

b7 b6 b5 b4

b3 b2 b1 b0

A/D Control Register 1

(1)

Symbol

Address

After Reset

ADCON1

00D7h

00h

Bit Symbol

Bit Name

Function

NOTES :

3. When the VCUT bit is set to “1”(connected) from “0” (not connected), w ait for 1µs or more before starting

A/D conversion.

b3 b2

VCUT

b1 b0

Refer to a description of the CKS0 bit in the

ADCON0 register function

b7 b6 b5 b4

—

(b2-b0)

If the ADCON1 register is rew ritten during A/D conversion, the conversion result is indeterminate.

CKS1

—

(b6-b7)

Reserved Bit

Vref Connect Bit(3)

0 : Vref not connected

1 : Vref connected

Set the BITS bit to “0” (8-bit mode) in repeat mode.

Reserved Bit

Set to “0”

8/10-bit Mode Select Bit(2)

0 : 8-bit mode

1 : 10-bit mode

Set to “0”

Frequency Select Bit 1

BITS

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