• 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: ....
  • Dual "far" DPTRs
    C51 7.0 supports dual DPTRs, at least in some major library routines. It also supports an extended DPTR. I'd like to be able to do both at once, to do block moves from far xdata to far xdata. It doesn...
  • clarity of dual dptr code
    to make an assembly routine clearer to read, I want to indicate which of the 2 dptrs are used in each instance. One is fetch, another is store. So, to achieve that, I insert the following: fptr...
  • Dual DPTR push in ISR - why?
    I'm looking to optimize an ISR written in C and wondered why version 6.21 pushes both DPTR when it doesn't use them both?
  • Simulating dual DPTR & movx for AT89S8252
    Hi! I'm simulating my program (ASM) in uVision v7.02a. When reading a byte from AT89S8252's internal EEPROM the movx instruction always uses the 1st DPTR, though the DPS is set to the 2nd DPTR. On...