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PIC18F4520E/MLQTP Datasheet(PDF) 130 Page - Microchip Technology

Part # PIC18F4520E/MLQTP
Description  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4520E/MLQTP Datasheet(HTML) 130 Page - Microchip Technology

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PIC18F2420/2520/4420/4520
DS39631A-page 128
Preliminary
 2004 Microchip Technology Inc.
12.1
Timer1 Operation
Timer1 can operate in one of these modes:
•Timer
• Synchronous Counter
• Asynchronous Counter
The operating mode is determined by the clock select
bit, TMR1CS (T1CON<1>). When TMR3CS is cleared
(= 0), Timer1 increments on every internal instruction
cycle (Fosc/4). When the bit is set, Timer1 increments
on every rising edge of the Timer1 external clock input
or the Timer1 oscillator, if enabled.
When Timer1 is enabled, the RC1/T1OSI and RC0/
T1OSO/T13CKI pins become inputs. This means the
values of TRISC<1:0> are ignored and the pins are
read as ‘0’.
FIGURE 12-1:
TIMER1 BLOCK DIAGRAM
FIGURE 12-2:
TIMER1 BLOCK DIAGRAM (16-BIT READ/WRITE MODE)
T1SYNC
TMR1CS
T1CKPS1:T1CKPS0
Sleep Input
T1OSCEN(1)
FOSC/4
Internal
Clock
On/Off
Prescaler
1, 2, 4, 8
Synchronize
Detect
1
0
2
T1OSO/T13CKI
T1OSI
1
0
TMR1ON
TMR1L
Set
TMR1IF
on Overflow
TMR1
High Byte
Clear TMR1
(CCP Special Event Trigger)
Timer1 Oscillator
Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain.
On/Off
Timer1
Timer1 Clock Input
T1SYNC
TMR1CS
T1CKPS1:T1CKPS0
Sleep Input
T1OSCEN(1)
FOSC/4
Internal
Clock
Prescaler
1, 2, 4, 8
Synchronize
Detect
1
0
2
T1OSO/T13CKI
T1OSI
Note 1: When enable bit, T1OSCEN, is cleared, the inverter and feedback resistor are turned off to eliminate power drain.
1
0
TMR1L
Internal Data Bus
8
Set
TMR1IF
on Overflow
TMR1
TMR1H
High Byte
8
8
8
Read TMR1L
Write TMR1L
8
TMR1ON
Clear TMR1
(CCP Special Event Trigger)
Timer1 Oscillator
On/Off
Timer1
Timer1 Clock Input



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