R8CSLASH13 datasheet(142/224 Pages) RENESAS

142 / 224 page

Rev.1.20

Jan 27, 2006

page 131 of 205

REJ09B0111-0120

R8C/13 Group

AD control register 0

Symbol

Address

After reset

ADCON0

00D616

00000XXX2

b7 b6 b5 b4 b3 b2 b1 b0

Analog input pin select

bit(2)

CH0

Bit symbol

Bit name

Function

CH1

CH2

AD operation mode select

bit(2)

1 : Repeat mode

ADST

A/D conversion start flag0 : A/D conversion disabled

1 : A/D conversion started

Frequency select bit 0(3)

0 : fAD/4 is selected

1 : fAD/2 is selected

CKS0

NOTES:

1. If the ADCON0 register is rewritten during A/D conversion, the conversion result is indeterminate.

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

3. This bit is valid when the CKS1 bit in the ADCON1 register is set to “0”.

4. The analog input pin can be selected by a combination of the CH2 to CH0 bits and ADGSEL0 bit as follows:

Set to “0”

Reserved bit

(b5)

AD control register 1

Symbol

Address

After reset

ADCON1

00D716

0016

Bit name

Function

Bit symbol

b7 b6 b5 b4 b3 b2 b1 b0

NOTES:

1. If the ADCON1 register is rewritten during A/D conversion, the conversion result is indeterminate.

2. In repeat mode, the BITS bit must be set to “0” (8-bit mode).

3. The fAD frequency must be 10 MHz or less.

4. If the VCUT bit is reset from “0” (Vref unconnected) to “1” (Vref connected), wait for 1 µs or more before starting A/D

conversion.

BITS

8/10-bit mode select

bit(2)

0 : 8-bit mode

VCUT

Vref connect bit(4)

1 : Vref connected

Frequency select

bit 1(3)

0 : CKS0 bit in ADCON0 register is valid

1 : fAD is selected

CKS1

Set to “0”

Reserved bit

(b2-b0)

Set to “0”

Reserved bit

(b6-b7)

(Note 4)

0: Port P0 group selected (AN0 to AN7)

1: Port P1 group selected (AN8 to AN11)

AD input group select bit(4)

ADGSEL0

CH2 to CH0

ADGSEL0=0

ADGSEL0=1

0002

0012

0102

0112

1002

1012

1102

1112

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

AN8

AN9

AN10

AN11

Avoid these

settings

(1)

Figure 14.5 ADCON0 Register and ADCON1 Register in Repeat Mode

14.2 Repeat mode

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