![](http://datasheet.mmic.net.cn/30000/M30280M8V-XXXHP_datasheet_2358818/M30280M8V-XXXHP_237.png)
15. A/D Converter
page 217
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Figure 15.7 ADCON0 to ADCON2 Registers in One-Shot Mode
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(2, 3)
CH0
Bit Symbol
Bit Name
Function
CH1
CH2
A/D operation mode
select bit 0 (3)
MD0
MD1
Trigger select bit
0: Software trigger
1: Hardware trigger (ADTRG trigger)
TRG
ADST
A/D conversion start flag
0: A/D conversion disabled
1: A/D conversion started
Frequency select bit 0
See Table 15.2
CKS0
RW
A/D Control Register 1 (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
SCAN0
SCAN1
MD2
BITS
8/10-bit mode select bit
0: 8-bit mode
1: 10-bit mode
VCUT
A/D operation mode
select bit 1
0: Other than repeat sweep mode 1
1: Vref connected
Frequency select bit 1
CKS1
RW
Invalid in one-shot mode
See Table 15.2
Nothing is assigned. If necessary, set to 0.
When read, the content is 0
(b7-b6)
NOTES:
1. If the ADCON1 register is rewritten during A/D conversion, the conversion result will be undefined.
2. 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.
Vref connect Bit (2)
0
A/D Control Register 2(1)
Symbol
Address
After Reset
ADCON2
03D416
0016
Bit Name
Function
Bit Symbol
b7 b6 b5 b4 b3 b2 b1 b0
A/D conversion method
select bit
SMP
Reserved bit
Set to 0
TRG1
A/D input group select bit
b2 b1
0 0: Select port P10 group
0 1: Select port P9 group
1 0: Select port P0 group
1 1: Select port P1/P9 group
Set to 0 in one-shot mode
Frequency select bit 2
CKS2
RW
0: Without sample and hold
1: With sample and hold
See Table 15.2
Nothing is assigned. If necessary, set to 0.
When read, the content is 0
(b7-b6)
NOTE:
1. If the ADCON2 register is rewritten during A/D conversion, the conversion result will be undefined.
Trigger select bit
ADGSEL0
ADGSEL1
(b3)
10
00
b2 b1 b0
0 0 0: Select AN0
0 0 1: Select AN1
0 1 0: Select AN2
0 1 1: Select AN3
1 0 0: Select AN4
1 0 1: Select AN5
1 1 0: Select AN6
1 1 1: Select AN7
b4 b3
0 0: One-shot mode or delayed trigger
mode 0,1
NOTES:
1. If the ADCON0 register is rewritten during A/D conversion, the conversion result will be undefined.
2. AN00 to AN07, AN20 to AN27, and AN30 to AN32 can be used in the same way as AN0 to AN7. Use bits ADGSEL1
and ADGSEL 0 in the ADCON2 register to select the desired pin.
3. After rewriting bits MD1 and MD0, set bits CH2 to CH0 over again using an another instruction.
00