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P89V51RD2 - IAP can't do it..

amit sabne

I am trying to work with the IAP for P89V51RD2.
I just tried to check the following code which I expect to
program the memory location 0x0020 with 01h.
I am using a clock=40 Mhz and am stroring that value in R0. But the code is not working. ie when I try to read memory from Flash Magic, I do not see any change at 0x0020
Can anyone fix the problem??

code is:

        ORG 00

                        MOV   DPH,#00h
                        MOV   DPL,#20h
                        MOV   A,#1h
                        MOV   R0,#40
                        MOV   R1,#02H
                        CALL  0FFF0H


                        END

Parents
  • 0 in reply to Bob Horeck

    No guys.. I got it working..
    It is surely not the case that frq should be 12MHz neither is it necessary to have C51 chip..
    The code is

     org 02100h

         PUSH    IE          ;DISABLE INTERRUPTS
         CLR     EA
                 MOV     A, 0B1h
         ANL     A,#0FCh   ;enable boot sector - !!! this command MUST be located ABOVE 2000h!!!
         MOV     0B1h, A
                 MOV   A,#1h
                 CALL    01FF0H      ;call to ISP_API (modifies B register but no Rx)

                 MOV   DPH,#00h
         MOV   DPL,#00h


                        MOV   R1,#02H        ; function code
                 MOV     A, 0B1h
                 ORL     A,#001h   ;switch back to user FLASH
                 MOV     0B1h, A
         POP     IE
END

Reply
  • 0 in reply to Bob Horeck

    No guys.. I got it working..
    It is surely not the case that frq should be 12MHz neither is it necessary to have C51 chip..
    The code is

     org 02100h

         PUSH    IE          ;DISABLE INTERRUPTS
         CLR     EA
                 MOV     A, 0B1h
         ANL     A,#0FCh   ;enable boot sector - !!! this command MUST be located ABOVE 2000h!!!
         MOV     0B1h, A
                 MOV   A,#1h
                 CALL    01FF0H      ;call to ISP_API (modifies B register but no Rx)

                 MOV   DPH,#00h
         MOV   DPL,#00h


                        MOV   R1,#02H        ; function code
                 MOV     A, 0B1h
                 ORL     A,#001h   ;switch back to user FLASH
                 MOV     0B1h, A
         POP     IE
END

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