14. A/D Converter
page 188
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A/D control register 1 (Note 1)
Symbol
Address
After reset
ADCON1
03D716
0016
Bit name
Function
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
A/D Sweep Pin
Select Bit (Note 2)
SCAN0
SCAN1
MD2
BITS
8/10-Bit Mode Select Bit
0 : 8-bit mode
1 : 10-bit mode
VCUT
VREF Connect Bit (Note 3)
A/D Operation Mode
Select Bit 1
1 : VREF connected
0
1
Frequency Select Bit 1
CKS1
0 : Any mode other than repeat sweep
mode 1
RW
Refer to Table 14.2 A/D Conversion
Frequency Select
(b7-b6)
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
Note 1: If the ADCON1 register is rewritten during A/D conversion, the conversion result will be indeterminate.
Note 2: AN30 to AN32 can be used in the same way as AN0 to AN7. Use the ADGSEL1 to ADGSET0 bits in the
ADCON2 register to select the desired pin.
Noe 3: If the VCUT bit is reset from “0” (VREF unconnected) to “1” (VREF connected), wait for 1 s or more before
starting A/D conversion.
When selecting repeat sweep mode 0
0 0 : AN0 to AN1 (2 pins)
0 1 : AN0 to AN3 (4 pins)
1 0 : AN0 to AN5 (6 pins)
1 1 : AN0 to AN7 (8 pins)
b1 b0
Note 1: If the ADCON2 register is rewritten during A/D conversion, the conversion result will be indeterminate.
A/D control register 2 (Note 1)
Symbol
Address
After reset
ADCON2
03D416
0016
b7
b6
b5
b4
b3
b2
b1
b0
A/D Conversion Method
Select Bit
Bit symbol
Bit name
Function
RW
SMP
Reserved Bit
Set to
“0”
0
A/D Input Group
Select Bit
0 0 : Select port P10 group (ANi)
0 1 : Select port P9 group (AN3i)
1 0 : Do not set
1 1 : Do not set
b2 b1
Frequency Select Bit 2
CKS2
ADGSEL0
ADGSEL1
RW
(b3)
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
(b7-b6)
Refer to Table 14.2 A/D Conversion
Frequency Select
RW
TRG1
Trigger Select Bit 1
0 : Without sample and hold
1 : With sample and hold
Set to "0" in repeat sweep mode 0
0
A/D control register 0 (Note 1)
Symbol
Address
After reset
ADCON0
03D616
00000XXX2
b7
b6
b5
b4
b3
b2
b1
b0
Analog Input Pin
Select Bit
CH0
Bit symbol
Bit name
Function
CH1
CH2
A/D Operation Mode
Select Bit 0
MD0
MD1
Trigger Select Bit
TR
G
ADST
A/D Conversion Start
Flag
0 : A/D conversion disabled
1 : A/D conversion started
Frequency Select Bit 0
CKS0
RW
1
RW
Refer to Table 14.2 A/D Conversion
Frequency Select
1
Note 1: If the ADCON0 register is rewritten during A/D conversion, the conversion result will be indeterminate.
0 : Software trigger
1 : Hardware trigger (ADTRG trigger)
Invalid in repeat sweep mode 0
1 1 : Repeat sweep mode 0 or
Repeat sweep mode 1
b4 b3
Figure 14.1.4.2 ADCON0 to ADCON2 Registers in Repeat Sweep Mode 0