TMR1是16位寬度的TMR1由2個8位的可讀寫的寄存器TMR1H和TMR1L組成。

TMR1有專門的啟停控制位TMR1ON，通過軟件可以任意啟動或暫停TMR1計(jì)數(shù)功能。

T1CON:TIMER1 CONTROL REGISTER

bit7-6 unimplemented :Read as ‘0’

bit5-4 T1CKPS1:T1CKPS0: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

bit3 T1OSCEN:Timer1 Oscillator Enable Control bit

1 = Oscillator is enable

0 = Oscillator is shut-off

bit2 T1SYNC:Timer1 External Clock Input Synchronization Control bit

when TMR1CS = 1

1= Do not synchronize external clock input

0= Synchronize external clock input

when TMR1CS = 0

This bit is ignored .Timer1 uses the internal clock when TMR1CS = 0.

bit1 TMR1CS:Timer1 Clock Source Select bit

1 = External clock from pin RC0/T1OSO/T1CKI

0 = Internal clock

bit0 TMR1ON:Timer1 on bit

1 = enables timer1

0 = stops timer1