PIC16F684-ESLASHST datasheet(38/164 Pages) MICROCHIP

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PIC16F684

DS41202C-page 36

Preliminary

 2004 Microchip Technology Inc.

4.2.4

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.

4.2.4.1

RA0/AN0/C1IN+/ICSPDAT/ULPWU

Figure 4-2 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

• an analog input to the comparator

• In-Circuit Serial Programming data

• an analog input for the Ultra Low-power Wake-up

4.2.4.2

RA1/AN1/C1IN-/VREF/ICSPCLK

Figure 4-2 shows the diagram for this pin. The RA1 pin

is configurable to function as one of the following:

• a general purpose I/O

• an analog input for the A/D

• an analog input to the comparator

• a voltage reference input for the A/D

• In-Circuit Serial Programming clock

FIGURE 4-2:

BLOCK DIAGRAM OF RA1

I/O PIN

VDD

VSS

VDD

Weak

Data Bus

WPUA

RD PORTA

PORTA

TRISA

IOCA

Interrupt-on-

To Comparator

Analog(1)

Input Mode

RAPU

Analog(1)

Input Mode

Change

Note

Comparator mode and ANSEL determines Analog

Input mode.

To A/D Converter

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