PIC16F688-ESLASHST datasheet(40/204 Pages) MICROCHIP

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PIC16F688

DS41203E-page 38

4.2.5.2

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

4.2.5.3

RA2/AN2/T0CKI/INT/C1OUT

Figure 4-3 shows the diagram for this pin. The RA2 pin

is configurable to function as one of the following:

• a general purpose I/O

• an analog input for the A/D

• the clock input for Timer0

• an external edge triggered interrupt

• a digital output from the comparator

FIGURE 4-3:

BLOCK DIAGRAM OF RA2

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

I/O pin

VDD

VSS

VDD

Weak

Analog(1)

Input Mode

Data Bus

WPUA

PORTA

TRISA

IOCA

To A/D Converter

C1OUT

Enable

To INT

To Timer0

Analog(1)

Input Mode

RAPU

RD PORTA

Interrupt-on-

change

Note

Analog Input mode is based upon ANSEL.

PIC16F688-E/ST Datasheet(PDF) 40 Page - Microchip Technology

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