putting P89V51RD2 in 6 clocks per machine cycle

[mihir]

" By default, the device runs at 12 clocks per machine cycle (X1 mode). The device has a clock doubling option to speed up to 6 clocks per machine cycle. Clock double mode can be enabled either by an external programmer or using IAP. " - Data Sheet P89C51RD2

I have tried Flash magic to do it. but under the "Options > Advance Options> Communication " the menu is hidden and i can't access it.

Please guide me how can i do it using flash Magic.

Your Sincerely,
Mihir

[Jan Waclawek]

Assuming you are talking about P89V51RD2, it's in the "main" window, a tickbox with a somewhat misleading name, "Prog Clocks Bit" (at least in version 3.61 I am currently using).

JW

[Andy Ayre]

It used to have a more specific name, until more devices appeared with different meanings for the bit.

Andy

[mihir]

Thanks Andy and Jan this solves the problem.

[prashanth]

This may sound silly to you people, but I wanted to confirm if it is possible to reset the v51rd2 mc to run at 12 clocks/mcycle when it has been programmed to run at 6 clocks/mcycle? If so what must I do?

[Andy Ayre]

I am not sure, sorry. Try contacting your local NXP FAE.

Andy

[bugmike25]

Setting the FST register to 0x08 should make it work with 6clocks/cycle. Am i correct?

[prashanth]

No...no....
You have to program the clock bit to make the mc run at 6 clocks per cycle when you write the hex code to the mc. Fst register just indicates whether the mc is running at 6 clocks per cycle.I guess you cannot alter it.