Datasheet

 2005-2015 Microchip Technology Inc. DS40001262F-page 83
PIC16F631/677/685/687/689/690
FIGURE 6-1: TIMER1 BLOCK DIAGRAM
TMR1H TMR1L
Oscillator
T1SYNC
T1CKPS<1:0>
Prescaler
1, 2, 4, 8
Synchronize
(3)
det
1
0
0
1
Synchronized
clock input
2
Set flag bit
TMR1IF on
Overflow
TMR1
(2)
TMR1GE
TMR1ON
T1OSCEN
1
0
SYNCC2OUT
(4)
T1GSS
T1GINV
To C2 Comparator Module
Timer1 Clock
TMR1CS
OSC2/T1G
OSC1/T1CKI
Note 1: ST Buffer is low power type when using LP oscillator, or high speed type when using T1CKI.
2: Timer1 register increments on rising edge.
3: Synchronize does not operate while in Sleep.
4: SYNCC2OUT is synchronized when the C2SYNC bit of the
CM2CON1 register is set.
(1)
EN
INTOSC
Without CLKOUT
F
OSC/4
Internal
Clock