
R8C/14 Group, R8C/15 Group 16. A/D Converter
Rev.2.10 Jan 19, 2006 Page 170 of 253
REJ09B0164-0210
Figure 16.2 ADCON0 and ADCON1 Registers
A/D Control Register 0
(1)
Symbol Address After Reset
ADCON0 00D6h 00000XXXb
Bit Symbol Bit Name Function RW
NOTES :
1.
2.
3.
4.
When changing A/D operatio mode, set the analog input pin again.
Set øAD frequency to 10MHz or below.
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
(4)
1 : Do not set
RW
If the ADCON0 register is rew ritten during A/D conversion, the conversion result is indeterminate.
CH0 to CH2 bits are enabled when the ADGSEL0 bit is set to “1”. After setting the ADGSEL0 bit to “1”, w rite to the
CH0 to CH2 bits.
ADST
A/D Conversion Start Flag 0 : Disabes A/D conversion
1 : Starts A/D conversion
RW
ADCAP
A/D Conversion Automatic
Start Bit
0 : Starts in software trigger (ADST bit)
1 : Starts in capture (Requests Timer Z interrupt)
RW
0 : On-shot mode
1 : Repeat mode
RW
RW
ADGSEL0 RW
A/D Input Group Select Bit 0 : Disabled
1 : Enabled (AN8 to AN11)
CH1 RW
CH0
CH2 RW
Analog Input Pin Select
Bit
(2)
b2 b1 b0
1 0 0 : AN8
1 0 1 : AN9
1 1 0 : AN10
1 1 1 : AN11
Other than above : Do not set
MD
A/D Operation Mode Select
Bit
(3)
b7 b6 b5 b4
1
b3 b2 b1 b0
1
A/D Control Register 1
(1)
Symbol Address After Reset
ADCON1
00D7h 00h
Bit Symbol Bit Name Function RW
NOTES :
1.
2.
3. When the VCUT bit is set to “1”(connected) from “0” (not connected), w ait for 1µs or more before starting
A/D conversion.
b3 b2
VCUT
b1 b0
00
Refer to a description of the CKS0 bit in the
ADCON0 register function
b7 b6 b5 b4
—
(b2-b0)
00 0
RW
If the ADCON1 register is rew ritten during A/D conversion, the conversion result is indeterminate.
CKS1 RW
RW
RW
—
(b6-b7)
Reserved Bit
Vref Connect Bit
(3)
0 : Vref not connected
1 : Vref connected
Set the BITS bit to “0” (8-bit mode) in repeat mode.
Reserved Bit Set to “0”
8/10-bit Mode Select Bit
(2)
0 : 8-bit mode
1 : 10-bit mode
RW
Set to “0”
Frequency Select Bit 1
BITS
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