Hello,and my first question...

Hello,i'm new here and new to the world of programming,ithough i've already had some success with picbasic,microcode ,pic12f629 asnd 16f628...my question... i want to replace a counter that writes and read a 1m x 8bits ram,so it has to be a 20 bit counter..the clock that drives that counter is between 20khz and 60 khz...i've tried performing that by polling the clock input pin (ra0 in a 16f628,using the internal 4mhz oscillator),incrementing the counter when it changes from 0 to one and using a flag to avoid increasing it twice on the same clock cycle...well,it works ok at low frequencies,but not at 20khz...i also have to control the read and write signals,monitor a run/stop input for storing ram locations...well,maybe is too much for pic basic,or i'm just an ignorasnt newbie(this is probably the case...)
Thanks for your help and ideas...

Moldava

It's not too much for PICBasic at all (remember, this is NOT an interpretive Basic), but might be too much for a 4MHz PIC all depending what it's got to do besides counting 60kHz pulses. This little ditty will show you how far you can go before things start falling apart... use a Double-Trace Scope, monitoring the Input and Output pins, wind the frequency up until the output starts to fall over... you might be surprised...

TRISB=%00000001

InputPin var PortB.0
OutputPin var PortB.7

Start:
Low OutputPin
Loop:
While InputPin=0:Wend
High OutputPin
While InputPin=1:Wend
Low OutputPin
Goto Loop

End

Melanie

Thanks,Melanie,i'll try it today...:-)