Timer1 - frequency measurement

[Acetronics2]

Looking at this ...pic. I do think PbP has not its place inside the 870 !!!

125 Khz * 256 = ... 32 Mhz

Alain

[-Dan-]

Looking at this ...pic. I do think PbP has not its place inside the 870 !!!

125 Khz * 256 = ... 32 Mhz

Alain

What do you mean?

and the 125khz is that the maximum frequency the 16f870 can capture?

[Bruce]

Timer1 can work with some pretty quick external input clocks. Check the electrical specs
section TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS.

Look at the specs for T1CKI High Time, T1CKI Low Time, and T1CKI Input Period.

With a pickup coil tuned to the frequency you're measuring, and the /64 output, it should
be pretty simple to measure your freq range.

[-Dan-]

Timer1 can work with some pretty quick external input clocks. Check the electrical specs
section TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS.

Look at the specs for T1CKI High Time, T1CKI Low Time, and T1CKI Input Period.

With a pickup coil tuned to the frequency you're measuring, and the /64 output, it should
be pretty simple to measure your freq range.

Hi Bruce,

I've read that, but i don't totally understand it, thats why i wanted some help in getting started, i no timer1 would do what i need, but i don't no how to control timer1, i've never written a program that uses it.

[aratti]

Visit the given link, schematic and code available.


http://digilander.libero.it/alfred73/eprojects.htm#1300 Mhz Frequencymeter with prescale

Al.

[Bruce]

I've read that, but i don't totally understand it

Which part are you having trouble with? I'll be happy to explain it.

thats why i wanted some help in getting started, i no timer1 would do what i need, but i don't no how to control timer1

T1CON on the 16F870 only has 6-bits that control the timer. Let me know what you don't understand that's in the data sheet, and I'll do my best to explain it. It would help if you tried a few code examples, and indicated which part you're having trouble with.

[-Dan-]

Which part are you having trouble with? I'll be happy to explain it.



T1CON on the 16F870 only has 6-bits that control the timer. Let me know what you don't understand that's in the data sheet, and I'll do my best to explain it. It would help if you tried a few code examples, and indicated which part you're having trouble with.

I don't understand how i work out, what the maximum frequency timer1 could capture from that data