PIC16C717TP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C717TP

18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-Bit A/D

Microchip Technology 

PIC16C717/770/771

6.1.1 TIMER1 COUNTER OPERATION

In this mode, Timer1 is being incremented via an exter-

nal source. Increments occur on a rising edge. After

Timer1 is enabled in counter mode, the module must

first have a falling edge before the counter begins to

increment.

FIGURE 6-1: TIMER1 INCREMENTING EDGE

T1CKI

(Initially high)

First falling edge

of the T1ON enabled

T1CKI

(Initially low)

First falling edge

of the T1ON enabled

Note: Arrows indicate counter increments.

FIGURE 6-2: TIMER1 BLOCK DIAGRAM

Set flag bit

TMR1IF on

Overflow

RB6/T1OSO/T1CKI/P1C

RB7/T1OSI/P1D

TMR1

0

TMR1H

T1OSC

TMR1L

TMR1ON

on/off

1

T1SYNC

T1OSCEN FOSC/4

Enable

Oscillator(1)

Internal

Clock

1

Prescaler

1, 2, 4, 8

0

2

T1CKPS<1:0>

TMR1CS

Synchronized

clock input

Synchronize

det

SLEEP input

Note 1: When the T1OSCEN bit is cleared, the inverter and feedback resistor are turned off. This eliminates power drain.

DS41120A-page 50

Advanced Information

© 1999 Microchip Technology Inc.

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