14. A/D Converter
page 195
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A/D control register 0 (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
TRG
ADST
A/D Conversion Start
Flag
0 : A/D conversion disabled
1 : A/D conversion started
Frequency Select Bit 0
CKS0
RW
A/D control register 1 (1)
Symbol
Address
After reset
ADCON1
03D716
00 16
Bit name
Function
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
A/D Sweep Pin
Select Bit (2)
SCAN0
SCAN1
MD2
BITS
8/10-Bit Mode Select Bit
0 : 8-bit mode
1 : 10-bit mode
VCUT
VREF Connect Bit (3)
A/D Operation Mode
Select Bit 1
1 : VREF connected
1
Frequency Select Bit 1
CKS1
1 : Repeat sweep mode 1
RW
Refer to Table 14.2 A/D Conversion
Frequency Select
Refer to Table 14.2 A/D Conversion
Frequency Select
(b7-b6)
1
NOTE:
1. If the ADCON2 register is rewritten during A/D conversion, the conversion result will be indeterminate.
A/D control register 2 (1)
Symbol
Address
After reset
ADCON2
03D4h
00h
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 (AN i)
0 1 : Select port P9 group (AN 3i)
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
NOTE:
1. If the ADCON0 register is rewritten during A/D conversion, the conversion result will be indeterminate.
0 : Software trigger
1 : Hardware trigger (AD TRG trigger)
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
0 : Without sample and hold
1 : With sample and hold
Set to "0" in repeat sweep mode 1
Invalid in repeat sweep mode 1
1 1 : Repeat sweep mode 0 or
Repeat sweep mode 1
b4 b3
When selecting repeat sweep mode 1
0 0 : AN0 (1 pin)
0 1 : AN0 to AN1 (2 pins)
1 0 : AN0 to AN2 (3 pins)
1 1 : AN0 to AN3 (4 pins)
b1 b0
0
NOTES:
1. If the ADCON1 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. AN30 to AN32 can be used in the same way as AN0 to AN7. Use the ADGSEL1 to ADGSEL0 bits 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
s or more before starting
A/D conversion.
Figure 14.1.5.2 ADCON0 to ADCON2 Registers in Repeat Sweep Mode 1