Renesas R8C/20 User Manual

R8C/20 Group, R8C/21 Group 18. A/D Converter
Rev.2.00 Aug 27, 2008 Page 362 of 458
REJ09B0250-0200
Figure 18.2 ADCON0 Register
A/D Control Register 0
(1)
Symbol Address After Reset
ADCON0 00D6h 00h
Bit Symbol Bit Name Function RW
NOTES:
1.
2.
3.
4.
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
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
RW
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.
ADST
A/D conversion start flag 0 : Disables A/D conversion
1 : Starts A/D conversion
RW
ADCAP
A/D conversion automatic
start bit
0 : Starts in softw are trigger (ADST bit)
1 : Starts in timer RD
(complementary PWM mode)
RW
0 : On-shot mode
1 : Repeat mode
RW
RW
ADGSEL0 RW
A/D input group select bit
(4)
0 : Selects port P0 group (AN0 to AN7)
1 : Selects port P1 group (AN8 to AN11)
CH1 RW
CH0
CH2 RW
Analog input pin select bit Refer to (4)
MD
A/D operation mode select
bit
(2)
b7 b6 b5 b4 b3 b2 b1 b0

Renesas R8C/20 Specifications

General

Brand	Renesas
Model	R8C/20
Category	Control Unit
Language	English