15. A/D Converter
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page 232
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15.1.3 Single Sweep Mode
In single sweep mode, analog voltages applied to the selected pins are converted one-by-one to a digital
code. Table 15.5 shows the single sweep mode specifications. Figure 15.10 shows the operation
example in single sweep mode. Figure 15.11 shows the ADCON0 to ADCON2 registers in single sweep
mode.
Item Specification
Function Bits SCAN1 to SCAN0 in the ADCON1 register and bits ADGSEL1 and
ADGSEL0 in the ADCON2 register select pins. Analog voltage applied to the
selected pins is converted one-by-one to a digital code
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
• A/D conversion completed(When selecting a software trigger, the ADST bit
is 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 from AN0 to AN1 (2 pins), AN0 to AN3 (4 pins), AN0 to AN5 (6 pins),
AN0 to AN7 (8 pins)
(1)
Readout of A/D Conversion Result
Readout one of registers AD0 to AD7 that corresponds to the selected pin
Table 15.5 Single Sweep Mode Specifications
NOTE:
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 15.10 Operation Example in Single Sweep Mode
A/D conversion started
A/D interrupt request generated
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
A/D pin input voltage
sampling
A/D pin conversion
•Example when selecting AN0 to AN3 to A/D sweep pins (SCAN1 to SCAN0 = 012)
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