T1CON – TIMER1 CONTROL REGISTER (ADDRESS: 10h).

 

bit 7   

Unimplemented: Read as ‘0’

 
bit 6  

Unimplemented: Read as ‘0’

 
bit 5   T1CKPS<1>: Timer1 Input Clock Prescale Select bits  
bit 4

T1CKPS<0>: Timer1 Input Clock Prescale Select bits

11 = 1:8 Prescale value
10 = 1:4 Prescale value
01 = 1:2 Prescale value
00 = 1:1 Prescale value

bit 3

T1OSCEN: Timer1 Oscillator Enable Control bit

1 = Oscillator is enabled
0 = Oscillator is shut off

The oscillator inverter and feedback resistor are turned off to eliminate power drain.

bit 2

T1SYNC: Timer1 External Clock Input Synchronization Control bit

TMR1CS = 1
1 = Do not synchronize external clock input
0 = Synchronize external clock input
TMR1CS = 0
This bit is ignored. Timer1 uses the internal clock when TMR1CS = 0.

bit 1

TMR1CS: Timer1 Clock Source Select bit

1 = External clock from pin RB6/T1OSO/T1CKI/PGC (on the rising edge)
0 = Internal clock (FOSC/4)

bit 0

TMR1ON: Timer1 On bit

1 = Enables Timer1
0 = Stops Timer1