Datasheet

© 2007 Microchip Technology Inc. DS41232D-page 65
PIC12F635/PIC16F636/639
FIGURE 6-1: TIMER1 BLOCK DIAGRAM
TMR1H TMR1L
Oscillator
T1SYNC
T1CKPS<1:0>
F
OSC/4
Internal
Clock
Prescaler
1, 2, 4, 8
1
0
0
1
Synchronized
clock input
2
Set flag bit
TMR1IF on
Overflow
TMR1
(2)
TMR1GE
TMR1ON
T1OSCEN
1
0
CxOUT
T1GSS
T1GINV
To C2 Comparator Module
Timer1 Clock
TMR1CS
OSC2/T1G
OSC1/T1CKI
Note 1: ST Buffer is low power type when using LP osc, or high speed type when using T1CKI.
2: Timer1 register increments on rising edge.
3: Synchronize does not operate while in Sleep.
(1)
EN
INTOSC
Without CLKOUT
1
0
T1ACS
F
OSC
Synchronize
(3)
det