Datasheet

PIC16F631/677/685/687/689/690
DS41262E-page 88 © 2008 Microchip Technology Inc.
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 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
T1GINV
(1)
TMR1GE
(2)
T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7 T1GINV: Timer1 Gate Invert bit
(1)
1 = Timer1 gate is active high (Timer1 counts when Timer1 gate signal is high)
0 = Timer1 gate is active low (Timer1 counts when gate is low)
bit 6 TMR1GE: Timer1 Gate Enable bit
(2)
If TMR1ON = 0:
This bit is ignored
If TMR1ON =
1:
1 = Timer1 counting is controlled by the Timer1 Gate function
0 = Timer1 is always counting
bit 5-4 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
bit 3 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 TMR1CS: Timer1 Clock Source Select bit
1 = External clock from T1CKI pin (on the rising edge)
0 = Internal clock (F
OSC/4)
bit 0 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.