Datasheet

14. A/D Converter
page 182
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Figure 14.2 ADCON0 to ADCON2 Registers
A/D control register 0 (1)
Symbol Address After reset
ADCON0 03D6
16 00000XXX 2
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
0 0 : One-shot mode or Delayed trigger mode 0,1
0 1 : Repeat mode
1 0 : Single sweep mode or
Simultaneous sample sweep mode
1 1 : Repeat sweep mode 0 or Repeat sweep
mode 1
MD0
MD1
Trigger Select Bit
0 : Software trigger
1 : Hardware trigger
TRG
ADST
A/D Conversion Start Flag
0 : A/D conversion disabled
1 : A/D conversion started
Frequency Select Bit 0
See Table 14.2 A/D Conversion
Frequency Select
CKS0
RW
A/D control register 1 (1)
Symbol Address After reset
ADCON1 03D7
16 00 16
Bit name Function
Bit symbol
b7 b6 b5 b4 b3 b2 b1 b0
A/D Sweep Pin Select Bit
SCAN0
SCAN1
MD2
BITS
8/10-Bit Mode Select Bit 0 : 8-bit mode
1 : 10-bit mode
VCUT
V
REF Connect Bit
(2)
A/D Operation Mode
Select Bit 1
0 : Other than repeat sweep mode 1
1 : Repeat sweep mode 1
0 : V
REF not connected
1 : V
REF connected
b4 b3
NOTE:
1. If the ADCON0 register is rewritten during A/D conversion, the conversion result will be indeterminate.
Frequency Select Bit 1
CKS1
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Function varies with each operation mode
Function varies with each operation mode
See Table 14.2 A/D Conversion
Frequency Select
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
(b7-b6)
NOTES:
1. If the ADCON1 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. If the VCUT bit is reset from “0” (V
REF unconnected) to “1” (V REF connected), wait for 1 µs or more before starting
A/D conversion
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 03D416 0016
b7 b6 b5 b4 b3 b2 b1 b0
A/D Conversion Method
Select Bit
0 : Without sample and hold
1 : With sample and hold
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
0 1 : Select port P9 group (AN
3i)
1 0 : Do not set
1 1 : Select port P9 group (AN
24)
b2 b1
Frequency Select Bit 2
CKS2
ADGSEL0
ADGSEL1
RW
RW
RW
RW
RW
(b3)
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
(b7-b6)
RW
TRG1
Trigger Select Bi
t
See Table 14.2 A/D Conversion
Frequency Select
Function varies with each operation
mode