C8051F38C-GM 데이터 시트보기 (PDF) - Silicon Laboratories

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C8051F38C-GM

Full Speed USB Flash MCU Family

Silicon Laboratories 

C8051F380/1/2/3/4/5/6/7/C

6.5. ADC0 Analog Multiplexer (C8051F380/1/2/3/C only)

AMUX0 selects the positive and negative inputs to the ADC. The positive input (AIN+) can be connected to

individual Port pins, the on-chip temperature sensor, or the positive power supply (VDD). The negative

input (AIN-) can be connected to individual Port pins, VREF, or GND. When GND is selected as the nega-

tive input, ADC0 operates in Single-ended Mode; at all other times, ADC0 operates in Differential Mode.

The ADC0 input channels are selected in the AMX0P and AMX0N registers as described in SFR Definition

6.9 and SFR Definition 6.10.

Important Note About ADC0 Input Configuration: Port pins selected as ADC0 inputs should be config-

ured as analog inputs, and should be skipped by the Digital Crossbar. To configure a Port pin for analog

input, set to 0 the corresponding bit in register PnMDIN. To force the Crossbar to skip a Port pin, set to 1

the corresponding bit in register PnSKIP. See Section “20. Port Input/Output” on page 153 for more Port

I/O configuration details.

Rev. 1.4

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