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Topic Summary

Posted by: radium98
« on: October 24, 2020, 04:53:13 pm »

Can you help me ,i built this wonderful unit counter in 2011 ,and i want today to delay the screen when it show pira for 5 seconds and reanme it to RD98 is it possible in the asm file and how thanks
Posted by: radium98
« on: April 17, 2012, 08:28:40 am »

please how can i pm u JAN i do that 3 times with no response please help i want to pm u with photos and some expications on what i want to do
Posted by: radium98
« on: October 01, 2011, 08:31:06 am »

JAN i use same pic16lf84a i have changed the oscillator hex value to HS with xtal 16mhz and prescaler U664B .THANKS
Posted by: Jan
« on: September 29, 2011, 07:28:20 pm »

Low power PIC with maximum frequency of 4 MHZ will surely not work on 16 MHz. The -04 in the mcu name means max. 4 MHz.
Posted by: radium98
« on: September 29, 2011, 03:23:17 pm »

Jan mine that i use is 16LF84A-04P will that work work 16MHZ quartz ?because i have an RDS encoder that use 16F84A with 16MHZ quartz .IF yes what do i have to do maybe re-burnig the HEX code .Thanks for explain. :-\
Posted by: Jan
« on: September 29, 2011, 02:21:17 pm »

I know only 16LF84A-04 or 16LF84A-20
Posted by: radium98
« on: September 29, 2011, 11:29:19 am »

JAN i use pic16LF84A.
Posted by: Jan
« on: September 29, 2011, 11:23:13 am »

As I mentioned above, if you use PIC16F84-04/P, it has a maximum frequency of 4 MHz so it will probably not work on 16 MHz. Make sure you've selected HS oscillator mode. If no succes, you must buy PIC16F84A-20/P.

It is also possible to use 4 MHz crystal and change the prescaller value in the asm file as showed below and compile it again:

Original value:
Code: [Select]
        MOVLW   B'01110011' ;prescaler & pull-ups
New value:
Code: [Select]
        MOVLW   B'01110101' ;prescaler & pull-ups
Posted by: radium98
« on: September 29, 2011, 11:11:50 am »

 :D :DDEAR JAN from my first result on the function of the 1 GHZ counter it seems to work perfect when i have put u664b scale by 64 and keeping the xtal firstly 4MHZ i have to divide the result by 4
exemple :exciter maun frequency 98.3 i saw on the led display of the freqquency counter 393.2 mhz /4=98.3.
changing the xtal to 8.00MHZ i have on the display 196.6 (196.6/2)=98.3 mhz .
the bad news that i cant get the xtal 16MHZ oscllate ,i have increased the value of the parralel capacitors from 22pf to 33pf and decreasing them to 15pf but nothing happened .i guet on yhe display NUMBER (P)

thanks for help.
Posted by: radium98
« on: September 24, 2011, 05:38:04 pm »

Thanks u are the man when it finished i will send final to u thanks for pira .i want to buy and this for my hobbie the audio spectrum analyser and one minirds but have some problem with the shippement hi price but its not a problem when my money will be enough :) i will surely buy them.1000 THANKS.
Posted by: Jan
« on: September 24, 2011, 05:10:17 pm »

It will work the same way with one exception - the display refresh rate will be 4 times higher but this makes no problem.
Posted by: radium98
« on: September 24, 2011, 02:46:57 pm »

ok sir when its finished i will upload the final project to the gallery .but i need exact response is it the same that if i up the xtal frequency from 4 to 16 and down the scale from 256 to 64 will this remain the same in work .yess or no .plz exact response .Thanks JAN for help
Posted by: Jan
« on: September 23, 2011, 09:24:59 pm »

I don't see any problem!  8)

For connection to the PIC you may use this picture http://www.datasheetarchive.com/dl/Datasheets-34/DSA-678559.pdf

Don't forget the PIC OSC must be set to HS in fuses. I think that the 16F84 has a maximum frequency of 10 MHz (the 16F84A has 20 MHz) but overclocking is possible. Let us know how it works...
Posted by: Radium98
« on: September 23, 2011, 06:54:14 pm »

dear juan

i am going to make the frequency counter but i have some dificulties on components side i need some help

i cant find the prescaler and no other equivalent that scale by 256 ,can i use prescaler u664b that scale by 64 and changing the xtal value from 4 to 16 mhz do that work.another thing can i use pic16lf84 because also cant find 16f84a.thanks
Posted by: Heinz
« on: July 13, 2011, 01:21:26 am »

Dear Jan

After some initial euphoria I must admit things are not as simple as changing the pre-scaler rate only. The changes are much more involved. As you indicated earlier a large junk of the code would have to be rewritten. This is a bit beyond my abilities. Anyway many thanks again for your comments.

73s de Heinz, VK4BZT