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how to initialize RTC DS12887A with 80C31

Nir boh

hello,
My address/data bus to interface the RTC is P1,
Chip Select is P3^6
DS is P3^4
AS is P3^3
R/W is P3^5.

How can i use a pointer to access the registers in the RTC (like a pointer that points to the base address of the RTC (0x0A) and i can increment it to point to the other locations of the RTC)?

thanks in advance.

Parents
  • 0 in reply to Andy Neil

    nice...
    i've selected A15 as 'chip select' for the RTC meaning :

    #define DS12887A XBYTE[0x8000]


    while the A15 is "on"='1' the uC in now scanning the RTC along with ALE(uC)=AS(on RTC) and alternately using RD(uC)=DS(RTC) and WR(uC)=R/W(RTC) i'm able to read/write to the RTC. is that correct ?

Reply
  • 0 in reply to Andy Neil

    nice...
    i've selected A15 as 'chip select' for the RTC meaning :

    #define DS12887A XBYTE[0x8000]


    while the A15 is "on"='1' the uC in now scanning the RTC along with ALE(uC)=AS(on RTC) and alternately using RD(uC)=DS(RTC) and WR(uC)=R/W(RTC) i'm able to read/write to the RTC. is that correct ?

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