[SOLVED] maximum frequency in pic 16 & 18

[Mohamed Slama]

hi all

i want to know the maximum frequency at pin T0CK1 in 16f877a & 18f452 to know if i used these pics as a frequency counter will count to what Hertz ?

i try the datasheet but i cant extract these information ...

 

[wp100]

hi all

i want to know the maximum frequency at pin T0CK1 in 16f877a & 18f452 to know if i used these pics as a frequency counter will count to what Hertz ?

i try the datasheet but i cant extract these information ...

Hi,

This link should give you some ideas of what you can obtain from a chip using a 20mhz crystal (possibly higher with the 452/pll)
https://www.qsl.net/dl4yhf/freq_counter/freq_counter.html#how_it_works

 

[Yosmany325]

Re: maximum frequency in pic 16 & 18

See section 5.2 of PIC16F877A datasheet, its named Using Timer0 with an External Clock.

- - - Updated - - -

Also see Table 17-6 of PIC16F877A datasheet, it is named Timer0 and Timer1 External Clock Requeriments, parameters 40, 41 & 42. Here the period is in nanoseconds, convert it to Hertz. For 18F... do the same check.

 

[Mohamed Slama]

tank you , done