PIC18F44J10 datasheet(122/368 Pages) MICROCHIP

tên linh kiện	PIC18F44J10

Giải thích chi tiết về linh kiện	28/40/44-Pin High-Performance, RISC Microcontrollers

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PIC18F45J10 FAMILY

DS39682E-page 120

12.1

Timer1 Operation

Timer1 can operate in one of these modes:

•Timer

• Synchronous Counter

• Asynchronous Counter

The operating mode is determined by the clock select

bit, TMR1CS (T1CON<1>). When TMR1CS is cleared

(= 0), Timer1 increments on every internal instruction

cycle (FOSC/4). When the bit is set, Timer1 increments

on every rising edge of the Timer1 external clock input

or the Timer1 oscillator, if enabled.

When Timer1 is enabled, the RC1/T1OSI and

RC0/T1OSO/T1CKI pins become inputs. This means

the values of TRISC<1:0> are ignored and the pins are

read as ‘0’.

FIGURE 12-1:

TIMER1 BLOCK DIAGRAM

T1SYNC

TMR1CS

T1CKPS<1:0>

Sleep Input

T1OSCEN(1)

FOSC/4

Internal

Clock

On/Off

Prescaler

1, 2, 4, 8

Synchronize

Detect

T1OSO/T1CKI

T1OSI

TMR1ON

TMR1L

Set

TMR1IF

on Overflow

TMR1

High Byte

Clear TMR1

(CCP Special Event Trigger)

Timer1 Oscillator

Note 1:

When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain.

On/Off

Timer1

Timer1 Clock Input

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