R8CSLASH20 datasheet(381/501 Pages) RENESAS

381 / 501 page

R8C/20 Group, R8C/21 Group

18. A/D Converter

Rev.2.00 Aug 27, 2008

Page 365 of 458

REJ09B0250-0200

Figure 18.4

ADCON0 Register in One-Shot Mode

A/D Control Register 0

(1)

Symbol

Address

After Reset

ADCON0

00D6h

00h

Bit Symbol

Bit Name

Function

NOTES:

ADGSEL0 = 0

ADGSEL0 = 1

AN0

AN1

AN2

AN3

AN4

AN8

AN5

AN9

AN6

AN10

AN7

AN11

100b

101b

110b

111b

CH2 to CH0

000b

Do not set

001b

010b

011b

b3 b2 b1

A/D operation mode select

bit(2)

b7 b6 b5 b4

CH2

Analog input pin select bit

Refer to (4)

0 : One-shot mode

ADGSEL0

A/D input group select bit(4) 0 : Selects port P0 group (AN0 to AN7)

1 : Selects port P1 group (AN8 to AN11)

CH1

CH0

ADCAP

A/D conversion automatic

start bit

0 : Starts in softw are trigger (ADST bit)

1 : Starts in timer RD

(complementary PWM mode)

ADST

A/D conversion start flag

0 : Disables A/D conversion

1 : Starts A/D conversion

Set øAD frequency to 10 MHz or below .

The analog input pin can be select according to a combination of the CH0 to CH2 bits and the ADGSEL0 bit.

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(3)

1 : Select fOCO-F

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

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

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