Datasheet

PIC16F630/676

3.2.3 PIN DESCRIPTIONS AND

DIAGRAMS

Each PORTA pin is multiplexed with other functions.

The pins and their combined functions are briefly

described here. For specific information about individ-

ual functions such as the comparator or the A/D, refer

to the appropriate section in this Data Sheet.

3.2.3.1 RA0/AN0/CIN+

Figure 3-1 shows the diagram for this pin. The RA0 pin

is configurable to function as one of the following:

• a general purpose I/O

• an analog input for the A/D (PIC16F676 only)

• an analog input to the comparator

3.2.3.2 RA1/AN1/CIN-/VREF

Figure 3-1 shows the diagram for this pin. The RA1 pin

is configurable to function as one of the following:

• as a general purpose I/O

• an analog input for the A/D (PIC16F676 only)

• an analog input to the comparator

• a voltage reference input for the A/D (PIC16F676

only)

FIGURE 3-1: BLOCK DIAGRAM OF RA0

AND RA1 PINS

I/O pin

VDD

VSS

VDD

Weak

Data Bus

WPUA

RD PORTA

PORTA

TRISA

IOCA

Interrupt-on-Change

To Comparator

To A/D Converter

Analog

Input Mode

RAPU

Analog

Input Mode