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Using TMR1 in 16F877

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How should I use the Timer1 module in PIC16F877 as a free running timer so that it could constantly generate a 1kHz square wave for a certain period of time, say 1 sec?  However, I am not going to use the timer1 oscillator as I have reserved the RC1/T1OSI/T1CKI for output.


Thanks!  :D

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