• Dual DPTR in the Debuger
    Hi! I use a T89C51CC01 from Atmel WM, I would like to use the dual dptr feature on my program. When I run the Debugger, i can't switch the DPTR. In the µC manual, it says that we must set the DPS...
  • 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...
  • 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...
  • 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?