PIC16F677T-ESS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F677T-ESS

20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F631/677/685/687/689/690

4.2.5.6 RA5/T1CKI/OSC1/CLKIN

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

RA5/T1CKI/OSC1/CLKIN pin is configurable to

function as one of the following:

• a general purpose I/O

• a Timer1 clock input

• a crystal/resonator connection

• a clock input

FIGURE 4-6:

BLOCK DIAGRAM OF RA5

Data Bus

DQ

WR

WPUA

CK Q

RD

WPUA

DQ

WR

PORTA

CK Q

WR

TRISA

DQ

CK Q

RD

TRISA

RD

PORTA

DQ

WR

IOCA

CK Q

RD

IOCA

Interrupt-on-

Change

INTOSC

Mode

TMR1LPEN(1)

VDD

Weak

RABPU

Oscillator

Circuit

OSC2

VDD

INTOSC

Mode

I/O Pin

VSS

(2)

QD

EN

Q3

QD

EN

RD PORTA

To TMR1 or CLKGEN

Note

1: Timer1 LP Oscillator enabled.

2: When using Timer1 with LP oscillator, the

Schmitt Trigger is bypassed.

© 2008 Microchip Technology Inc.

DS41262E-page 67

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