PIC16F946 Datasheet, PDF (89/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
6.0 TIMER1 MODULE WITH GATE
CONTROL
The PIC16F946 has a 16-bit timer. Figure 6-1 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:
- Selectable gate source: T1G or C2 output
(T1GSS)
- Selectable gate polarity (T1GINV)
• Optional LP oscillator
The Timer1 Control register (T1CON), shown in
Register 6-1, is used to enable/disable Timer1 and
select the various features of the Timer1 module.
FIGURE 6-1:
TIMER1 ON THE PIC16F946 BLOCK DIAGRAM
TMR1ON
T1GE
Set Flag bit
TMR1IF on
Overflow
Clear on special
event trigger
TMR1⁽¹⁾
TMR1H
TMR1L
TMR1ON
T1GE
To C2 Comparator Module
TMR1 Clock
Synchronized
0
Clock Input
T1GINV
OSC1/T1OSI
OSC2/T1OSO
FOSC = 000
FOSC = x00
T1OSCEN
LP OSC
1
(2)
1
1
FOSC/4
0 _{Internal 0}
Clock
T1SYNC
Prescaler
1, 2, 4, 8
2
T1CKPS<1:0>
Synchronize
det
Sleep Input
T1CS
RC4/T1G/
1
SDO/SEG11
RC5/T1CKI/
CCP1/SEG10
C2OUT
0
T1GSS
Note 1: Timer1 increments on the rising edge.
2: ST Buffer is low-power type when using LP oscillator or high-speed type when using T1CKI.
© 2005 Microchip Technology Inc.
Preliminary
DS41265A-page 87