15. A/D Converter
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page 236
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15.1.5 Repeat Sweep Mode 1
In repeat sweep mode 1, analog voltage is applied to the all selected pins are converted to a digital code,
with mainly used in the selected pins. Table 15.7 shows the repeat sweep mode 1 specifications. Figure
15.14 shows the operation example in repeat sweep mode 1. Figure 15.15 shows registers ADCON0 to
ADCON2 in repeat sweep mode 1.
Table 15.7 Repeat Sweep Mode 1 Specifications
Item Specification
Function Bits SCAN1 and SCAN0 in the ADCON1 register and bits ADGSEL1 and
ADGSEL0 in the ADCON2 register mainly select pins. Analog voltage applied
to the all selected pins is repeatedly converted to a digital code
Example : When selecting AN0
Analog voltage is converted to a digital code in the following order
AN0 AN1 AN0 AN2 AN0 AN3, and so on.
A/D Conversion Start Condition
• When the TRG bit in the ADCON0 register is 0 (software trigger)
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 Pins Mainly Select from AN0 (1 pins), AN0 to AN1 (2 pins), AN0 to AN2 (3 pins), AN0 to
Used in A/D Conversions AN3 (4 pins)
(1)
Readout of A/D Conversion Result
Readout one of registers AD0 to AD7 that corresponds to the selected pin
NOTES:
1. AN00 to AN07, AN 20 to AN27, and
AN3
0
to AN3
2
can be used in the same way as AN0 to AN7.
However, all input pins need to belong to the same group.
Figure 15.14 Operation Example in Repeat Sweep Mode 1
•Example when selecting AN
0
to A/D sweep pins (SCAN1 to SCAN0 = 00
2
)
AN
0
AN
1
AN
2
AN
3
AN
4
AN
5
AN
6
AN
7
A/D conversion started
A/D pin input voltage
sampling
A/D pin conversion
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