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8051 interfacing with 6264 RAM

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ntq1633

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8051 interfacing with 6264 RAM and 7-Segment LED

I have a schematic of 8051 interfacing with 6264 below, but I think it's problem. Could anyone to tell me what the problem with my schematic is.
**broken link removed**
Thank you !
 
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If program memory resides in the MCU (version with built-in ROM, EProm, OTP or Flash) and RAM is properly addressed using A13, A14 and A15 then I can’t see any hardware issues ..
What’s your concern?

IanP
:wink:
 
I have written the code to display 1234 on the led. But it has not worked. I'm confusing !

ORG 2000H
LOOP:
MOV A,#0E4H ;number 4
CALL DISPLAY
MOV A,#0D3H ;number 3
CALL DISPLAY
MOV A,#0B2H ;number 2
CALL DISPLAY
MOV A,#071H ;number 1
CALL DISPLAY
JMP LOOP
DISPLAY:
MOV DPTR,#0000H
MOVX @DPTR,A
CALL DELAY2S
RET
DELAY2S:
MOV TMOD,#01H
MOV TH0,#HIGH(-5000)
MOV TL0,#LOW(-5000)
SETB TR0
JNB TF0,$
CLR TR0
CLR TF0
RET
END
 

First, make the delay time about 1ms ..
Then, keep in mind that the current to segments has only 25% duty ratio and it is limited by resistors ..
You selected 10k and that value is much, much to big .. try something like 100ohms ..

IanP
:wink:
 

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  • 8051 - RAM - 7-seg1.png
    8051 - RAM - 7-seg1.png
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Thank you !!! I made it !!!
 

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