Frequency Counter using PIC and PicBasic

[mister_e]

Here's the basic of TIMER1

Timer1 is act as a back ground counter on RB6 pin on the PIC16F628. It store the result in TMR1L and TMR1H register.

So you need to:

• 1. set TMR1L and TMR1H to 0, to make the counter begin count at 0.
  2. start the counter By using T1CON=7

The above set timer to:

• 1. No sychro from the internal to the internal clock [bit 2]
  2. Use external RB6 as clock source [bit 1]
  3. Enable timer1 [bit 0]

then after you just have to wait for the sampling time you want to use. Once it's finish. stop the timer with T1CON=0

Now your result is store into internal register TMR1L and TMR1H in two Byte format. Place them into one WORD variable and display your count

MyCount var word

MyCount.lowbyte=TMR1L
MyCount.HighByte=TMR1H

lcdout $FE,1,"MyCount",#Mycount

you can test if the TIMER1 has overflow by testing PIR1.0 If 0 then there's no overflow. If 1... TIMER1 has overflow.

If it has overflow, you must clear it by software PIR1.0=0