PIC12F615 datasheet(47/168 Pages) MICROCHIP

47 / 168 page

Preliminary

DS41302A-page 45

PIC12F609/615/12HV609/615

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.

Clock Source

TMR1CS

T1ACS

FOSC/4

FOSC

T1CKI pin

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