how to generate two signals from two ports at the same time by using p16f84

[bikxsici]

hi

for my homework i am supposed to build a circuit by using pic16f84 generating two squarewave signals having different selectable precision frequencies such that 2,2 khz or 2,4 khz etc. throughout different ports at the same time.

i have used tmr0 and other some methods to build it too much but i could not generate that precision frequencies. it seems so diffucult!!!

thanks for all helps

[mackrackit]

Have you read this thread?
http://www.picbasic.co.uk/forum/show...t=14652&page=1

[bikxsici]

let me look at

[bikxsici]

i guess if pic16f84 have had 2 timers , it would be easy but it has not and how do we generate two different signals by using one timer at the same time?

so diffucult

[cncmachineguy]

the program i posted in that thread uses 1 timer. That timer is used to generate a time base to drive 4 software counters. these counters become my timers.

[bikxsici]

hi cncmachineguy

yes i recognized it but pic16f84 drived by max 10 mhz and we need so precision time period , max +-2 micro second precision, when we use instructions like if ,else we have problem.

when we are asked to generate two signals 630 micro seconds and 453 micro second by porta.0 and porta.1, for example, 633 micro seconds is not acceptable.