R8C/13 Group
14. A/D Converter
AD control register 0(1)
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
ADCON0
Address
00D616
After reset
00000XXX2
0
Bit symbol
Bit name
Function
RW
RW
Analog input pin select bit
CH0
See Note 4.
RW
RW
CH1
CH2
MD
0 : One-shot mode
1 : Repeat mode
AD operation mode select
bit(2)
RW
RW
AD input group select bit(4)
0: Port P0 group selected (AN
1: Port P1 group selected (AN
0
8
to AN
to AN11
7)
ADGSEL0
)
Reserved bit
Set to “0”
RW
RW
(b5)
A/D conversion start flag
0 : A/D conversion disabled
1 : A/D conversion started
ADST
Frequency select bit 0(3)
0 : fAD/4 is selected
1 : fAD/2 is selected
CKS0
RW
NOTES:
1. If the ADCON 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:
CH2 to CH0
ADGSEL0=0
ADGSEL0=1
AN
AN
AN
AN
AN
AN
AN
AN
0
1
2
3
4
5
6
7
000
001
010
011
100
101
110
111
2
2
2
2
2
2
2
2
Avoid these
settings
AN
AN
8
9
AN10
AN11
(1)
AD control register 1
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
ADCON1
Address
00D716
After reset
0016
0
0
0 0 0
Bit symbol
(b2-b0)
Bit name
Reserved bit
Function
RW
RW
Set to “0”
8/10-bit mode select
bit(2)
0 : 8-bit mode
1 : 10-bit mode
RW
RW
BITS
0 : CKS0 bit in ADCON0 register is valid
1 : fAD is selected
Frequency select
bit 1(3)
CKS1
Vref connect bit(4)
0 : Vref not connected
1 : Vref connected
VCUT
RW
RW
Reserved bit
Set to “0”
(b6-b7)
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 φAD 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.
Figure 14.2 ADCON0 Register and ADCON1 Register
Rev.1.20 Jan 27, 2006 page 126 of 205
REJ09B0111-0120
RENESAS [ RENESAS TECHNOLOGY CORP ]
