15. A/D Converter
puorG92/C61M
page 230
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2110-1010B90JER
15.1.2 Repeat mode
In repeat mode, analog voltage applied to a selected pin is repeatedly converted to a digital code. Table
15.4 shows the repeat mode specifications. Figure 15.8 shows the operation example in repeat mode.
Figure 15.9 shows the ADCON0 to ADCON2 registers in repeat mode.
Item Specification
Function Bits CH2 to CH0 in the ADCON0 register and the ADGSEL1 to ADGSEL0 bits
in the ADCON2 register select pins. Analog voltage applied to a selected pin
is repeatedly converted to a digital code
A/D Conversion Start
• When the TRG bit in the ADCON0 register is 0 (software trigger)
Condition
Set the ADST bit in the ADCON0 register to 1 (A/D conversion started)
• When the TRG bit in the ADCON0 register is 1 (hardware trigger)
The ADTRG pin input changes state from “H” to “L” after setting the ADST bit
to 1 (A/D conversion started)
A/D Conversion Stop Condition
Set the ADST bit to 0 (A/D conversion halted)
Interrupt Request Generation Timing
None generated
Analog Input Pin
Select one pin from AN
0
to AN
7
, AN0
0
to AN0
7
, AN2
0
to AN2
7
, and AN3
0
to AN3
2
Readout of A/D Conversion Result
Readout one of the AD0 to AD7 registers that corresponds to the selected pin
Table 15.4 Repeat Mode Specifications
Figure 15.8 Operation Example in Repeat Mode
•Example when selecting AN
2
to an analog input pin
(Ch2 to CH0 = 010
2
)
A/D conversion started
AN
0
AN
1
AN
2
AN
3
AN
4
AN
5
AN
6
AN
7
A/D pin input voltage
sampling
A/D pin conversion
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