PIC16F684-ESLASHST datasheet(40/164 Pages) MICROCHIP

40 / 164 page

PIC16F684

DS41202C-page 38

Preliminary

 2004 Microchip Technology Inc.

4.2.4.5

RA4/AN3/T1G/OSC2/CLKOUT

Figure 4-5 shows the diagram for this pin. The RA4 pin

is configurable to function as one of the following:

• a general purpose I/O

• an analog input for the A/D

• a TMR1 gate input

• a crystal/resonator connection

• a clock output

FIGURE 4-5:

BLOCK DIAGRAM OF RA4

4.2.4.6

RA5/T1CKI/OSC1/CLKIN

Figure 4-6 shows the diagram for this pin. The RA5 pin

is configurable to function as one of the following:

• a general purpose I/O

•a TMR1 clock input

• a crystal/resonator connection

• a clock input

FIGURE 4-6:

BLOCK DIAGRAM OF RA5

I/O PIN

VDD

VSS

VDD

Weak

Analog

Input Mode

Data Bus

WPUA

PORTA

TRISA

IOCA

FOSC/4

To A/D Converter

Oscillator

Circuit

OSC1

CLKOUT

Enable

Analog(3)

Input Mode

RAPU

RD PORTA

To T1G

INTOSC/

RC/EC(2)

CLK(1)

Modes

CLKOUT

Enable

Note 1: CLK modes are XT, HS, LP, LPTMR1 and CLKOUT

Enable.

2: With CLKOUT option.

3: Analog Input mode comes from ANSEL.

Interrupt-on-

Change

I/O PIN

VDD

VSS

VDD

Weak

Data Bus

WPUA

PORTA

TRISA

IOCA

To TMR1 or CLKGEN

INTOSC

Mode

RD PORTA

INTOSC

Mode

RAPU

OSC2

(2)

Note

Timer1 LP Oscillator enabled.

When using Timer1 with LP oscillator, the

Schmitt Trigger is bypassed.

TMR1LPEN(1)

Interrupt-on-

Change

Oscillator

Circuit

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