16F630 datasheet(24/132 Pages) MICROCHIP

24 / 132 page

PIC16F630/676

DS40039C-page 22

 2003 Microchip Technology Inc.

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

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