PIC18FXX39 Datasheet, PDF (104/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

PIC18FXX39
11.1 Timer1 Operation
Timer1 can operate in one of these modes:
• As a timer
• As a synchronous counter
• As an asynchronous counter
The Operating mode is determined by the clock select
bit, TMR1CS (T1CON<1>). When TMR1CS = 0,
Timer1 increments every instruction cycle. When
TMR1CS = 1, Timer1 increments on every rising edge
of the external clock input.
FIGURE 11-1:
TIMER1 BLOCK DIAGRAM
TMR1IF
Overflow
Interrupt
Flag bit
T13CKI
TMR1
0
TMR1H
TMR1L
TMR1ON
On/Off
1
T1SYNC
1
FOSC/4
Internal 0
Clock
Prescaler
1, 2, 4, 8
2
T1CKPS1:T1CKPS0
TMR1CS
Synchronized
Clock Input
Synchronize
det
SLEEP Input
FIGURE 11-2:
TIMER1 BLOCK DIAGRAM: 16-BIT READ/WRITE MODE
Data Bus<7:0>
8
TMR1H
8
8
Write TMR1L
Read TMR1L
TMR1IF
Overflow
Interrupt
Flag bit
T13CKI
8
TMR1
Timer 1
High Byte
TMR1L
Synchronized
0
Clock Input
1
TMR1ON
on/off
T1SYNC
1
FOSC/4
Internal
Clock
0
TMR1CS
Prescaler
1, 2, 4, 8
2
T1CKPS1:T1CKPS0
Synchronize
det
SLEEP Input
DS30485B-page 104
Preliminary
 2002-2013 Microchip Technology Inc.