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Author Topic: 74LS373 Latch Problem with AT89C51  (Read 2316 times)
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jeniusj
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« on: June 05, 2009, 12:22:39 12:22 »

Actually I have to receive the 3-bytes thorough serial link and then these three bytes are then converted into parallel.
I use 74245 buffer and then use three 74LS373 latches....But the problem is that there is only first byte present at all the latches.Then I debug this by connecting two latches instead of three to check the 74LS373 working,The code is as below

org 0h
LE1 bit P1.1
LE2 bit P1.2

        mov P1,#00h   ;clear Port1
main: mov P2,#0AAh ;place dats on port2 which is data port for byte.
        setb LE1
        acall delay
        clr LE1

        acall delay  ; wait for sometime before placing the next data

        mov P2,#55h
        setb LE2
        acall delay
        clr LE2

       sjmp main

delay:  mov r2,#250
here  : djnz r2,here
          ret
end

When I dump the following code then is appear to be toggling on both latches......
I have tried many times but cant get the exact reason for this
Before that I have successfully interface the 74LS373 for data/address demultiplexing in 8051

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manish12
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« Reply #1 on: July 15, 2009, 05:39:33 17:39 »

this could be solve your prob,

org 0h
LE1 bit P1.1
LE2 bit P1.2

        mov P1,#00h   ;clear Port1
main: mov P2,#0AAh ;place dats on port2 which is data port for byte.
        clr LE1
        acall delay
        setb  LE1

        acall delay  ; wait for sometime before placing the next data

        mov P2,#55h
        clr LE2
        acall delay
        setb  LE2

       sjmp main

delay:  mov r2,#250
here  : djnz r2,here
          ret
end
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