PIC18F-LF1XK50 MICROCHIP [Microchip Technology], PIC18F-LF1XK50 Datasheet - Page 106

• Manufacturer Part Number: PIC18F-LF1XK50
• Description: 20-Pin USB Flash Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F/LF1XK50
11.1
Timer1 can operate in one of the following modes:
• Timer
• Synchronous Counter
• Asynchronous Counter
The operating mode is determined by the clock select
bit, TMR1CS of the T1CON register. When TMR1CS is
cleared (= 0), Timer1 increments on every internal
FIGURE 11-1:
FIGURE 11-2:
DS41350E-page 106
Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain.
Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain.
T1OSI/T13CKI
T1OSI/T13CKI
Timer1 Operation
T1OSO
T1OSO
T1OSCEN
Timer1 Oscillator
T1CKPS<1:0>
T1SYNC
TMR1ON
Timer1 Oscillator
T1OSCEN
TIMER1 BLOCK DIAGRAM
TIMER1 BLOCK DIAGRAM (16-BIT READ/WRITE MODE)
T1CKPS<1:0>
T1SYNC
TMR1ON
(1)
(1)
TMR1CS
TMR1CS
(CCP Special Event Trigger)
(CCP Special Event Trigger)
Clear TMR1
Clear TMR1
Clock
Internal
F
Clock
Internal
F
OSC
OSC
/4
/4
Preliminary
On/Off
1
0
1
0
Timer1 Clock Input
Timer1 Clock Input
Prescaler
1, 2, 4, 8
Prescaler
1, 2, 4, 8
instruction cycle (F
increments on every rising edge of either the Timer1
external clock input or the Timer1 oscillator, if enabled.
When the Timer1 oscillator is enabled, the digital
circuitry associated with the T1OSI and T1OSO pins is
disabled. This means the values of TRISC<1:0> are
ignored and the pins are read as ‘0’.
2
2
TMR1L
TMR1L
8
Sleep Input
Synchronize
Sleep Input
8
Synchronize
OSC
Detect
Detect
High Byte
High Byte
TMR1H
TMR1
TMR1
/4). When the bit is set, Timer1
8
 2010 Microchip Technology Inc.
8
8
Internal Data Bus
1
0
1
0
Read TMR1L
Write TMR1L
on Overflow
on Overflow
TMR1IF
TMR1IF
Set
Set
Timer1
On/Off
Timer1
On/Off