
Rev.2.10 Apr 14, 2006 page 211 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 16. A/D Converter
Figure 16.6 Registers ADCON0 and ADCON1 in Single Sweep Mode
CH0
CH1
CH2
MD0
MD1
TRG
ADST
CKS0
1 0 : Single sweep mode
0 : Software trigger
1 : ADTRG trigger
0 : A/D conversion disabled
1 : A/D conversion started
Refer to NOTE 2 for ADCON2
Register
Trigger select bit
A/D conversion start flag
Frequency select bit 0
Analog input pin select bits
A/D operating mode
select bits 0
A/D Control Register 0
(1)
b7 b6 b5 b4 b3 b2 b1 b0
Bit Symbol
Bit Name Function
RW
RW
RW
RW
RW
RW
RW
RW
RW
Invalid in single sweep mode
Symbol Address After Reset
ADCON0 03D6h 00000XXXb
b4 b3
1
RW
RW
RW
RW
RW
RW
RW
RW
SCAN0
SCAN1
MD2
BITS
VCUT
OPA0
OPA1
CKS1
Bit Name Function
Bit Symbol
RW
Symbol Address After Reset
ADCON1 03D7h 00h
0 : 8-bit mode
1 : 10-bit mode
Set to 0 when single sweep mode
is selected
1 : VREF connected
Refer to NOTE 2 for ADCON2
Register
When single sweep mode is selected
A/D sweep pin select bits
8/10-bit mode select bit
VREF connect bit
(3)
A/D operating mode
select bit 1
External op-amp
connection mode bits
Frequency select bit 1
0 0 :
ANEX0 and ANEX1 are not used
0 1 : Do not set a value
1 0 : Do not set a value
1 1 :
External op-amp connection mode
b7 b6 b5 b4 b3 b2 b1 b0
A/D Control Register 1
(1)
b7 b6
0 0 : AN0, AN1 (2 pins)
0 1 : AN0 to AN3 (4 pins)
1 0 : AN0 to AN5 (6 pins)
1 1 : AN0 to AN7 (8 pins)
(2)
b1 b0
10
0
NOTE:
1. If the ADCON0 register is rewritten during A/D conversion, the conversion result will be undefined.
NOTES:
1. If the ADCON1 register is rewritten during A/D conversion, the conversion result will be undefined.
2. AN0_0 to AN0_7, and AN2_0 to AN2_7 can be used in same way as AN0 to AN7. Use bits ADGSEL1 to
ADGSEL0 in the ADCON2 register to select the desired pin.
3. 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.
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