PIC16F628-20SLASHSS datasheet(50/160 Pages) MICROCHIP

50 / 160 page

PIC16F62X

DS40300B-page 50

Preliminary

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 the CCP module (Section 10.0).

For the PIC16F627 and PIC16F628, when the Timer1

oscillator is enabled (T1OSCEN is set), the RB7/T1OSI

and RB6/T1OSO/T1CKI pins become inputs. That is,

the TRISB<7:6> value is ignored.

T1CON: TIMER1 CONTROL REGISTER (ADDRESS 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: T1CKPS1:T1CKPS0: 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

Note: The oscillator inverter and feedback resistor are 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 RB6/T1OSO/T1CKI (on the rising edge)

= Internal clock (FOSC/4)

bit 0:

TMR1ON: Timer1 On bit

= Enables Timer1

= Stops Timer1

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