Datasheet

PIC16F882/883/884/886/887

DS41291G-page 46  2006-2012 Microchip Technology Inc.

3.2.3.4 RA3/AN3/VREF+/C1IN+

Figure 3-4 shows the diagram for this pin. This pin is

configurable to function as one of the following:

• a general purpose input

• an analog input for the ADC

• a positive voltage reference input for the ADC and

CVREF

• a positive analog input to Comparator C1

FIGURE 3-4: BLOCK DIAGRAM OF RA3

3.2.3.5 RA4/T0CKI/C1OUT

Figure 3-5 shows the diagram for this pin. This pin is

configurable to function as one of the following:

• a general purpose I/O

• a clock input for Timer0

• a digital output from Comparator C1

FIGURE 3-5: BLOCK DIAGRAM OF RA4

I/O Pin

VDD

VSS

Analog

(1)

Input Mode

Data Bus

PORTA

TRISA

Note 1: ANSEL determines Analog Input mode.

To Comparator (VREF+)

To Comparator (positive input)

To A/D Converter (VREF+)

To A/D Converter (analog channel)

I/O Pin

VDD

VSS

Data Bus

PORTA

TRISA

C1OUT

Enable

To Tim e r 0