PIC16F676 Microchip Technology Inc., PIC16F676 Datasheet - Page 34

• Manufacturer Part Number: PIC16F676
• Description: 14-pin, Flash-based 8-bit Cmos Microcontroller
• Manufacturer: Microchip Technology Inc.

PIC16F630/676
5.0
The PIC16F630/676 devices have a 16-bit timer.
Figure 5-1 shows the basic block diagram of the Timer1
module. Timer1 has the following features:
• 16-bit timer/counter (TMR1H:TMR1L)
• Readable and writable
• Internal or external clock selection
• Synchronous or asynchronous operation
• Interrupt on overflow from FFFFh to 0000h
• Wake-up upon overflow (Asynchronous mode)
• Optional external enable input (T1G)
• Optional LP oscillator
FIGURE 5-1:
DS40039E-page 32
TIMER1 MODULE WITH GATE
CONTROL
INTOSC
w/o CLKOUT
T1OSCEN
LP
OSC1
OSC2
TIMER1 BLOCK DIAGRAM
Set Flag bit
TMR1IF on
Overflow
LP Oscillator
TMR1H
TMR1
TMR1L
Clock
F
Internal
OSC
/4
The Timer1 Control register (T1CON), shown in
Register 5-1, is used to enable/disable Timer1 and
select the various features of the Timer1 module.
TMR1CS
1
0
Note:
T1CKPS<1:0>
T1SYNC
Additional information on timer modules is
available in the PIC
ence Manual, (DS33023).
Prescaler
1, 2, 4, 8
0
1
2
TMR1ON
TMR1GE
TMR1ON
TMR1GE
© 2007 Microchip Technology Inc.
Synchronized
Clock Input
SLEEP Input
Synchronize
®
Detect
Mid-Range Refer-
T1G