PIC16 datasheet(169/418 Pages) MICROCHIP

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DS40001609C-page 169

PIC16(L)F1508/9

19.7

Timer1 Interrupt

The Timer1 register pair (TMR1H:TMR1L) increments

to FFFFh and rolls over to 0000h. When Timer1 rolls

over, the Timer1 interrupt flag bit of the PIR1 register is

set. To enable the interrupt on rollover, you must set

these bits:

• TMR1ON bit of the T1CON register

• TMR1IE bit of the PIE1 register

• PEIE bit of the INTCON register

• GIE bit of the INTCON register

The interrupt is cleared by clearing the TMR1IF bit in

the Interrupt Service Routine.

19.8

Timer1 Operation During Sleep

Timer1 can only operate during Sleep when setup in

Asynchronous Counter mode. In this mode, an external

crystal or clock source can be used to increment the

counter. To set up the timer to wake the device:

• TMR1ON bit of the T1CON register must be set

• TMR1IE bit of the PIE1 register must be set

• PEIE bit of the INTCON register must be set

• T1SYNC bit of the T1CON register must be set

• TMR1CS bits of the T1CON register must be

configured

• T1OSCEN bit of the T1CON register must be

configured

The device will wake-up on an overflow and execute

the next instructions. If the GIE bit of the INTCON

Routine.

Timer1 oscillator will continue to operate in Sleep

regardless of the T1SYNC bit setting.

19.8.1

ALTERNATE PIN LOCATIONS

This module incorporates I/O pins that can be moved to

other locations with the use of the alternate pin function

moved and what their default locations are upon a

Reset, see Section 11.1 “Alternate Pin Function” for

more information.

FIGURE 19-2:

TIMER1 INCREMENTING EDGE

Note:

The TMR1H:TMR1L register pair and the

TMR1IF bit should be cleared before

enabling interrupts.

T1CKI = 1

when TMR1

Enabled

T1CKI = 0

when TMR1

Enabled

Note 1: Arrows indicate counter increments.

2: In Counter mode, a falling edge must be registered by the counter prior to the first incrementing rising edge of the clock.

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