Author Topic: SAA1057 PLL Code Question  (Read 1260 times)

Joel

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SAA1057 PLL Code Question
« on: February 07, 2017, 10:33:18 pm »
Hello,

I am working on this project.
http://www.pira.cz/enpll.htm
I am trying to change the frequency range from the 82.5 - 108 to at least 98-118 MHz.

I am pretty sure this can be done in the code for the PIC involving worda of the SAA1057. possibly here.
START   CLRWDT
        CLRF    PORTA
        CLRF    COUNT
        MOVLW   B'00100000'
        MOVWF   WORKA
        MOVLW   B'00111010'
        MOVWF   WORKB
I am having trouble changing things to get the proper frequency. the code can be found on the site as well.

Thanks,

Joel

Jan

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  • Posts: 559
Re: SAA1057 PLL Code Question
« Reply #1 on: February 08, 2017, 05:18:57 pm »
This project is maybe 20 years old so I'm afraid that nobody knows the answer. I do not recommend this design for today use.