Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SSOP 28 8-Bit 20 MHz I/O number 24

 2006-2012 Microchip Technology Inc. DS41291G-page 45

PIC16F882/883/884/886/887

3.2.3.2 RA1/AN1/C12IN1-

Figure 3-2 shows the diagram for this pin. This pin is

configurable to function as one of the following:

• a general purpose I/O

• an analog input for the ADC

• a negative analog input to Comparator C1 or C2

FIGURE 3-2: BLOCK DIAGRAM OF RA1

3.2.3.3 RA2/AN2/V

REF-/CVREF/C2IN+

Figure 3-3 shows the diagram for this pin. This pin is

configurable to function as one of the following:

• a general purpose I/O

• an analog input for the ADC

• a negative voltage reference input for the ADC

and CVREF

• a comparator voltage reference output

• a positive analog input to Comparator C2

FIGURE 3-3: BLOCK DIAGRAM OF RA2

I/O Pin

VDD

VSS

Analog

(1)

Input Mode

Data Bus

PORTA

TRISA

To A/D Converter

Note 1: ANSEL determines Analog Input mode.

To Comparator

I/O Pin

VDD

VSS

Analog

(1)

Input Mode

Data Bus

PORTA

TRISA

To Comparator (VREF-)

Note 1: ANSEL determines Analog Input mode.

To Comparator (positive input)

CVREF

VROE

To A/D Converter (VREF-)

To A/D Converter (analog channel)