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Problem with Writing the code on Controller

Huzaifah Shabbir

I am working on AT89C51, the problem is that although my assembly code is working perfectly on the pinnacle simulator it gives a verification failed error when I try to write it on the programmer using ezdl4 s/w.

Simple programs with commands to send and recieve data on the serial port work fine and get written on the controller, but when I use commands like ACALL or MOVC in my code it gives me the verification failed error.

Example of a Code working on the programmer.

ORG 0H

MOV TMOD,#20h
MOV TH1,#98h
MOV SCON,#50H
SETB TR1

ECHO:

RECV: JNB RI,RECV
MOV A,SBUF
CLR RI

MOV SBUF,A
SEND: JNB TI,SEND
CLR TI

SJMP ECHO

END

Example of a Code not Working

MOV TMOD,#20h
MOV TH1,#98h
MOV SCON,#50H
SETB TR1

MOV DPTR,#MYDATA

H_1:
CLR A
MOVC A,@A+DPTR
JZ B_1
ACALL SEND
INC DPTR
SJMP H_1

SEND: MOV SBUF,A
JNB TI,$
CLR TI
RET

MYDATA: DB "SeriaL Data Transmission 123",0H

B_1:
HERE:SJMP HERE
END

Note: I have a 12Mhz crystal and so i am using a baudrate of 300bps.

Could anyone please tell me whats the problem asap.
Thank you

Parents
  • 0 in reply to Neil Kurzmam

    I took my programmer to the persom form where I bought it. My programmer was working perfectly at his place and writing the files which gave me a verify failed error.

    I used the same programmer, software and controller but was working perfectly fine at his place. The only difference was that we used different power supplies. He was proabably giving somewhere around 15V and I usually give it somewhere between 16-18V. Now is it possible that due to the different voltage levels my programmer burns some codes and gives error on others?

Reply
  • 0 in reply to Neil Kurzmam

    I took my programmer to the persom form where I bought it. My programmer was working perfectly at his place and writing the files which gave me a verify failed error.

    I used the same programmer, software and controller but was working perfectly fine at his place. The only difference was that we used different power supplies. He was proabably giving somewhere around 15V and I usually give it somewhere between 16-18V. Now is it possible that due to the different voltage levels my programmer burns some codes and gives error on others?

Children
  • 0 in reply to Huzaifah Shabbir

    programming requires absolute precision of everything.

    I actually doubt your voltage is the problem, but my first action would be trying to fix that.

    If the 'programmer' is connected to the serial port, read on, otherwise tell us how it is connected to the PC:

    My best guess is that the 'programmer' is 'cheating' on the RS232 interface which will make it work with some PCs and not with others.

    Did the 'programmer' work before you changed your PC?

    If you can, see if the "programmer" contains a MAX232(equivalent)

    Erik

  • 0 in reply to Huzaifah Shabbir

    "He was proabably giving somewhere around 15V and I usually give it somewhere between 16-18V."

    As Erik says, parallel programming does require close adherence to the specifications.

    So, what is the specified power supply for this "programmer"? If you are operating it out-of-spec, then all bets are off; there is no reason to believe that it will operate correctly - you are in undefined operation territory.