Datasheet

14. A/D Converter
page 186
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14.1 Operation Modes
14.1.1 One-Shot Mode
In one-shot mode, analog voltage applied to a selected pin is once converted to a digital code. Table
14.1.1.1 shows the one-shot mode specifications. Figure 14.1.1.1 shows the operation example in one-
shot mode. Figure 14.1.1.2 shows the ADCON0 to ADCON2 registers in one-shot mode.
Table 14.1.1.1 One-shot Mode Specifications
Item Specification
Function The CH2 to CH0 bits in the ADCON0 register and the ADGSEL1 to
ADGSEL0 bits in the ADCON2 register select pins. Analog voltage applied to
a selected pin is once 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 • A/D conversion completed (If a software trigger is selected, the ADST bit is
Condition set to “0” (A/D conversion halted)).
• Set the ADST bit to “0”
Interrupt Request Generation Timing A/D conversion completed
Analog Input Pin Select one pin from AN 0 to AN 7 , AN 30 to AN 32 , AN 24
Readout of A/D Conversion Result Readout one of the AD0 to AD7 registers that corresponds to the selected pin
Figure 14.1.1.1 Operation Example in One-Shot Mode
•Example when selecting AN2 to an analog input pin (Ch2 to CH0=0102)
AN
0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
A/D conversion started
A/D interrupt request generated
A/D pin input voltage
sampling
A/D pin conversion