Datasheet

14. A/D Converter
page 195
923fo7002,51.beF00.2.veR
0020-2020B90JER
)T62/C61M,B62/C61M,A62/C61M(puorGA62/C61M
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
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 03D716 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
11
Frequency Select Bit 1
CKS1
1 : 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)
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
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 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 : AN
0 (1 pin)
0 1 : AN
0 to AN1 (2 pins)
1 0 : AN0 to AN2 (3 pins)
1 1 : AN
0 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. 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” (VREF connected), wait for 1 µs or more before starting
A/D conversion.
Figure 14.1.5.2 ADCON0 to ADCON2 Registers in Repeat Sweep Mode 1