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2000 Microchip Technology Inc.

Preliminary

DS41124C-page 45

PIC16C745/765

7.0

TIMER1 MODULE

The Timer1 module is a 16-bit timer/counter consisting

of two 8-bit registers (TMR1H and TMR1L), which are

readable and writable. The TMR1 Register pair

(TMR1H:TMR1L) increments from 0000h to FFFFh

and rolls over to 0000h. The TMR1 interrupt, if enabled,

is generated on overflow, which is latched in interrupt

flag bit TMR1IF (PIR1<0>). This interrupt can be

enabled/disabled by setting/clearing TMR1 interrupt

enable bit TMR1IE (PIE1<0>).

Timer1 can operate in one of two modes:

As a timer

As a counter

The operating mode is determined by the clock select

bit, TMR1CS (T1CON<1>).

In timer mode, Timer1 increments every instruction

cycle.

In counter mode, it increments on every rising

edge of the external clock input.

Timer1 can be enabled/disabled by setting/clearing

control bit TMR1ON (T1CON<0>).

Timer1 also has an internal “RESET input”. This

RESET can be generated by either of the two CCP

modules (Section 9.0). Register 7-1 shows the Timer1

control register.

When the Timer1 oscillator is enabled (T1OSCEN is

set), the RC1/T1OSI/CCP2 and RC0/T1OSO/T1CKI

pins become inputs. That is, the TRISC<1:0> value is

ignored.

Additional information on timer modules is available in

the PICmicro Mid-Range MCU Family Reference

Manual (DS33023).

REGISTER 7-1:

TIMER1 CONTROL REGISTER (T1CON: 10h)

U-0

R/W-0

—

T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as ‘0’

- n = Value at POR reset

bit7

bit0

bit 7-6:

Unimplemented: Read as '0'

bit 5-4:

T1CKPS<1:0>: Timer1 Input Clock Prescale Select bits

= 1:8 Prescale value

= 1:4 Prescale value

= 1:2 Prescale value

= 1:1 Prescale value

bit 3:

T1OSCEN: Timer1 Oscillator Enable Control bit

= Oscillator is enabled

= Oscillator is shut off (The oscillator inverter is turned off to eliminate power drain)

bit 2:

T1SYNC: Timer1 External Clock Input Synchronization Control bit

TMR1CS = 1

= Do not synchronize external clock input

= Synchronize external clock input

TMR1CS = 0

This bit is ignored. Timer1 uses the internal clock when TMR1CS = 0.

bit 1:

TMR1CS: Timer1 Clock Source Select bit

= External clock from pin RC0/T1OSO/T1CKI (1) or RC1/T1OSI/CCP2

= Internal clock (FINT)

bit 0:

TMR1ON: Timer1 On bit

= Enables Timer1

= Stops Timer1

Note 1: On the rising edge after the first falling edge.

745cov.book Page 45 Wednesday, August 2, 2000 8:24 AM

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