Question about sbit definitions

So it is mandatory to handle this in software without asking for any changes in the hardware for backward compatibility reasons.
yeah, yeah, have heard that one before - are you management?

1) you evidently must reprogram the uC, what hinders a reprogram of the FPGA.
2) whatever "is mandatory to handle" you cant' make the '51 grow new instructions.
3) you never answered "may not fit in the internal RAM" --- "RAM??? what are you talking about, in a '51 the code is in ROM/PROM?Flash."

Erik

So it is mandatory to handle this in software without asking for any changes in the hardware for backward compatibility reasons.
yeah, yeah, have heard that one before - are you management?

1) you evidently must reprogram the uC, what hinders a reprogram of the FPGA.
2) whatever "is mandatory to handle" you cant' make the '51 grow new instructions.
3) you never answered "may not fit in the internal RAM" --- "RAM??? what are you talking about, in a '51 the code is in ROM/PROM?Flash."

Erik

Sorry, that was a typo'. It is Internal RAM and not ROM.

now you absolutotally lose me.

You post "RAM"
I ask "did you mean ROM"
You post "Sorry, that was a typo'. It is Internal RAM and not ROM."

To stop all confusion, please post
"My code is in ROM"
or
"My code is in RAM"

and a followup question
Is the uC socketed?

Erik

also, how about answering 1)

OOPS. My code is in ROM.

I dont understand your question

"Is the uC socketed?"

Ok, is the uC (microcontroller) socketed (in a socket or soldered to the board).

Erik

Soldered to the board. Thanks

suresh,

He's asking if the microcontroller is installed in a socket. What he's wondering is if you plan to perform this upgrade by sending the customer a new chip with the new code on it for him to replace. Otherwise, he's wondering if there's some mechanism to just reprogram the FPGA in the same manner as the controller (JTAG, etc.).

The long and short of it is this: People here are not trying to lead you astray. The ONLY ways to do what you're doing are:

1.) Put an if() at EACH place where you'd access this pin and let that select which pin to toggle.

2.) Reconfigure some programmable portion of your hardware.

3.) Use accesses to the whole port and masking in one of two possible values to toggle the pin. (Like I believe erik mentioned above)

There is no way to do what you want with the 8051. Your backwarsds compatibility requirement cannot be met by any other means than the above. If none of them is acceptable, then despite it being a requirement, you cannot do what you want.

Ok, I achieved what i wanted by passing the pins as parameters to the same function based on an IF condition.

Example:
Pulse_TCK(bit sbJTAG_TCK); //Definition

I am calling the above function as follows:

if (old_board)
{
Pulse_TCK(JTAG_TDO);
}
else
{
Pulse_TCK(ALT_JTAG_TDO);
}

Thanks for all your inputs.

after umpteen posts complaining about the time it takes and whatnot, you choose what was suggested in the very first answer.

Erik