Datasheet

14. A/D Converter
page 191
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0020-2020B90JER
)T62/C61M,B62/C61M,A62/C61M(puorGA62/C61M
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
MD0
MD
1
Trigger Select Bit
TRG
ADST
A/D Conversion Start
Flag
0 : A/D conversion disabled
1 : A/D conversion started
Frequency Select Bit 0CKS0
RW
A/D control register 1
(1)
Symbol Address After reset
ADCON1 03D7 16 00 16
Bit name FunctionBit symbol
b7 b6 b5 b4 b3 b2 b1 b0
A/D Sweep Pin
Select Bit
(2)
SCAN0
SCAN1
MD
2
BITS
8/10-Bit Mode Select Bit 0 : 8-bit mode
1 : 10-bit mode
VCUT
V
REF Connect Bit
(3)
A/D Operation Mode
Select Bit 1
1 : V
REF connected
1
01
Frequency Select Bit 1
CKS1
0 : Any mode other than repeat sweep
mode 1
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Refer to Table 14.2 A/D Conversion
Frequency Select
Refer to Table 14.2 A/D Conversion
Frequency Select
(b7-b6)
0
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
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
RW
RW
RW
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 single sweep mode
Invalid in single sweep mode
1 0 : Single sweep mode or simultaneous
sample sweep mode
b4 b3
When selecting single sweep mode
0 0 : AN
0 to AN1 (2 pins)
0 1 : AN
0 to AN3 (4 pins)
1 0 : AN
0 to AN5 (6 pins)
1 1 : AN
0 to AN7 (8 pins)
b1 b0
0
NOTES:
1. If the ADCON1 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. AN
30 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” (V
REF unconnected) to “1” (VREFconnected), wait for 1 µs or more before starting A/D
conversion.
Figure 14.1.3.2 ADCON0 to ADCON2 Registers in Single Sweep Mode