R8C2K datasheet(367/471 Pages) RENESAS

367 / 471 page

R8C/2K Group, R8C/2L Group

19. A/D Converter

Rev.1.10

Dec 21, 2007

Page 350 of 450

REJ09B0406-0110

Figure 19.2

ADCON0 Register

A/D Control Register 0

(1)

Symbol

Address

After Reset

ADCON0

00D6h

00h

Bit Symbol

Bit Name

Function

NOTES:

b3 b2 b1

A/D operating mode select

bit(2)

b7 b6 b5 b4

CH2

Analog input pin select bits (Note 4)

0 : One-shot mode

1 : Repeat mode

ADGSEL0

A/D input group select bit(4) 0 : Selects port P0 group (AN2, AN4 to AN7)

1 : Selects port P1 group (AN8 to AN11)

CH1

CH0

ADCAP

A/D conversion automatic

start bit

0 : Starts at softw are trigger (ADST bit)

1 : Starts at timer RD

(complementary PWM mode)

ADST

A/D conversion start flag

0 : Stops A/D conversion

1 : Starts A/D conversion

Set øAD frequency to 10 MHz or below .

The analog input pin can be selected according to a combination of bits CH0 to CH2 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 undefined.

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

CH2 to CH0

000b

001b

010b

011b

100b

101b

110b

111b

ADGSEL0=0

—

Do not set.

AN2

Do not set.

AN4

AN5

AN6

AN7

ADGSEL0=1

Do not set.

AN8

AN9

AN10

AN11

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