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Gentlemen, Does anybody know how to switch 89C51Rx2 into 12-clock mode? M.P.
The 12X clock is a programming option. Your prom burner must have the correct software. The RX2 will load with the same algorithm as the RX+, but the 12X clock is a new programming option. Your prom burner will need to be updated with new software/firmware to handle this. Optionally, the distributor can program this bit for you prior to shipment. However, once set, this bit CANNOT BE REPROGRAMMED. So once you decide to use it at the slower speed, it cannot be changed.
Thanks, Tom, But what do you mean by "correct software"? What electric manipulations should be made with the chip to switch it into 12-clock mode? Where is it described? I found nothing in the datasheet... M.P.
But what do you mean by "correct software"? I'm sure he means for your PROM programmer. I use a Needhams' EMP-20 PROM programmer that can program 89C51RD+ parts but I'd need to get new software from Needhams' to program the RD2 part, see http://www.needhams.com. You're not trying to change the clock mode at run-time are you? You can't do that. - Mark