PIC16F631/677/685/687/689/690
6.12 Timer1 Control Register
The Timer1 Control register (T1CON), shown in
Register 6-1, is used to control Timer1 and select the
various features of the Timer1 module.
REGISTER 6-1:
T1CON: TIMER 1 CONTROL REGISTER
R/W-0
T1GINV(1)
R/W-0
TMR1GE(2)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
T1CKPS1
T1CKPS0
T1OSCEN
T1SYNC
TMR1CS
TMR1ON
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 7
bit 6
T1GINV: Timer1 Gate Invert bit(1)
1= Timer1 gate is active high (Timer1 counts when gate is high)
0= Timer1 gate is active low (Timer1 counts when gate is low)
TMR1GE: Timer1 Gate Enable bit(2)
If TMR1ON = 0:
This bit is ignored
If TMR1ON = 1:
1= Timer1 is on if Timer1 gate is not active
0= Timer1 is on
bit 5-4
bit 3
T1CKPS<1:0>: 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
T1OSCEN: LP Oscillator Enable Control bit
If INTOSC without CLKOUT oscillator is active:
1= LP oscillator is enabled for Timer1 clock
0= LP oscillator is off
Else:
This bit is ignored
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
bit 1
bit 0
TMR1CS: Timer1 Clock Source Select bit
1= External clock from T1CKI pin (on the rising edge)
0= Internal clock (FOSC/4)
TMR1ON: Timer1 On bit
1= Enables Timer1
0= Stops Timer1
Note 1: T1GINV bit inverts the Timer1 gate logic, regardless of source.
2: TMR1GE bit must be set to use either T1G pin or C2OUT, as selected by the T1GSS bit of the CM2CON1
register, as a Timer1 gate source.
DS41262D-page 88
© 2007 Microchip Technology Inc.
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