• the unnecessary DPTR re-load in C51
    I have found the following optimization problem in C51 v7.06a: the access to a structure member with offset>0 (XDATA) causes the unnecessary DPTR reload (and computing). There was no such problem in C51...
  • using 2 DPTRs with C51 v3.20
    I'm using quite old version of C51, v3.20. Is there a way to tell the compiler to use the second DPTR of Atmel 89C55WD also?
  • A strange problem regarding pointer
    I MUST set a pointer to 0xFF0000 in code space and use instructions as follows: char code *ptr = 0xFF0000; value = *ptr; On debugging, I watch the following code from diassemble window: 11...
  • Dual DPTR
    Hi I want to use dual DPTR on my 89c669 from Philips. When i insert the pragma #pragma modp2 I get this error(s) *** ERROR L127: UNRESOLVED EXTERNAL SYMBOL SYMBOL: ?C?STRCPYP2 MODULE: ....
  • PC to DPTR ?
    Hi, How to move the program counter(PC) to DPTR.Can any one suggest on this. Thanks in advance, Regards, Gopi