Interfacing CD4052 with 2 uarts in 8051

Hey all,

I am doing a project on Vehicle Tracking System using GPS and GSM Modem.The 2 devices aforementioned communicates with 8051uC. But since there is only 1 UART in 8051 i have to use a analog multiplexer i.e CD 4062. I want to know how to interface it with GPS, GSM, and 8051.

Also it would be grateful if anyone could tell me how to parse output of GPS and how initialize a GPS receiver to that it starts giving me the GPRMC

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  • I agree that I didn't look onto the link: http://www.keil.com/dd/search_parm.asp.
    And I admit my lack of interest(as you say) then.

    But when I seriously tried to come back by the statements But nevertheless, can't we now just get back to the basics.
    What u all did again tried to outdo me when I asked you about XRAM.
    See I knew what are MOVX instructions - they are used to move the data from or into an external memory. But the doubt was if its external memory how is it ON CHIP.
    Since it was stated ON CHIP Extended memory I thought that it could be something different. Hence I thought that If i could just clear my doubts by posting in the forum. Instead of getting the doubt cleared what I received from u all was berated statements likeI thought you said you were familiar with the 8051 architecture?! and What do we mean by Extended RAM (XRAM).

    The fact that you ask this puts the lie to your earlier claim that you were keen on using an 8051 because you "knew the architecture". You clearly don't..
    I do believe REAL help is to make you more self-reliable which includes reading datasheets. But the way you should say all such things is also very important.

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