PIC16F16-ESLASHP datasheet(31/136 Pages) MICROCHIP

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DS41206B-page 29

PIC16F716

5.0

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

• Interrupt on overflow

• Wake-up on overflow (external clock,

Asynchronous mode only)

• Time base for the Capture/Compare function

• Special Event Trigger (with ECCP)

Figure 5-1 is a block diagram of the Timer1 module.

5.1

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.

5.2

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 5-1:

TIMER1 BLOCK DIAGRAM

5.2.1

INTERNAL CLOCK SOURCE

When the internal clock source is selected, the

TMR1H:TMR1L register pair will increment on multiples

of TCY as determined by the Timer1 prescaler.

5.2.2

EXTERNAL CLOCK SOURCE

When the external clock source is selected, the Timer1

module may work as a timer or a counter.

When counting, Timer1 is incremented on the rising

edge of the external clock input T1CKI. In addition, the

Counter mode clock can be synchronized to the

microcontroller system clock or run asynchronously.

In Counter mode, a falling edge must be registered by

the counter prior to the first incrementing rising edge

after one or more of the following conditions:

• Timer1 is enabled after POR or BOR Reset

• A write to TMR1H or TMR1L

• T1CKI is high when Timer1 is disabled and when

Timer1 is reenabled T1CKI is low. See Figure 5-2.

Note 1:

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

Timer1 register increments on rising edge.

Synchronize does not operate while in Sleep.

TMR1H

TMR1L

T1OSC

T1SYNC

T1CKPS<1:0>

Sleep input

T1OSCEN

Enable

Oscillator(1)

FOSC/4

Internal

Clock

TMR1ON

on/off

Prescaler

1, 2, 4, 8

Synchronize

det

Synchronized

clock input

RB1/T1OSO/T1CKI

RB2/T1OSI

Set flag bit

TMR1IF on

Overflow

TMR1(2)

(3)

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