PIC16F684 datasheet(49/192 Pages) MICROCHIP

49 / 192 page

DS41202F-page 47

PIC16F684

6.0

TIMER1 MODULE WITH GATE

CONTROL

The Timer1 module is a 16-bit timer/counter with the

following features:

• 16-bit timer/counter register pair (TMR1H:TMR1L)

• Programmable internal or external clock source

• 3-bit prescaler

• Optional LP oscillator

• Synchronous or asynchronous operation

• Timer1 gate (count enable) via comparator or

T1G pin

• Interrupt on overflow

• Wake-up on overflow (external clock,

Asynchronous mode only)

• Time base for the Capture/Compare function

• Special Event Trigger (with ECCP)

• Comparator output synchronization to Timer1

clock

Figure 6-1 is a block diagram of the Timer1 module.

6.1

Timer1 Operation

The Timer1 module is a 16-bit incrementing counter

which is accessed through the TMR1H:TMR1L register

pair. Writes to TMR1H or TMR1L directly update the

counter.

When used with an internal clock source, the module is

a timer. When used with an external clock source, the

module can be used as either a timer or counter.

6.2

Clock Source Selection

The TMR1CS bit of the T1CON register is used to select

the clock source. When TMR1CS = 0, the clock source

is FOSC/4. When TMR1CS = 1, the clock source is

supplied externally.

FIGURE 6-1:

TIMER1 BLOCK DIAGRAM

Clock Source

TMR1CS

FOSC/4

T1CKI pin

TMR1H

TMR1L

Oscillator

T1SYNC

T1CKPS<1:0>

Prescaler

1, 2, 4, 8

Synchronize

det(2)

Synchronized

clock input

Set flag bit

TMR1IF on

Overflow

TMR1(1)

TMR1GE

TMR1ON

T1OSCEN

C2OUT

T1GSS

T1GINV

To C2 Comparator Module

Timer1 Clock

TMR1CS

OSC2/T1G

OSC1/T1CKI

ST Buffer is low power type when using LP osc, or high speed type when using T1CKI.

Note

Timer1 register increments on rising edge.

Synchronize does not operate while in Sleep.

FOSC/4

Internal

Clock

FOSC = 100

FOSC = 000

Sleep

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