The P89V51RD2 is an 80C51 microcontroller with 64 kB Flash and bytes of data RAM. A key feature of the P89V51RD2 is its X2 mode option. The design. 89C51RD2BN datasheet, 89C51RD2BN pdf, 89C51RD2BN data sheet, datasheet, data sheet, pdf. 89C51RD2BN part, 89C51RD2BN sell, 89C51RD2BN buy, 89C51RD2BN stock, 89C51RD2BN datasheet, Semiconductor, Electronic Components,Buy.

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Please login or register. Did you miss your activation email? Home Help Search Login Register. Part way through the programming cycle a message box “Unable to communicate” is displayed and the program halts. Once the failure has occurred of course, the boot vector is destroyed and has to be restored on a parallel programmer. When observing the behaviour of my own program at the point of failure, no reply at all is received from the 89C51RD2BN to one of the “program data” frames no “X”, no dataheet, no “.

89c5r1d2bn Magic isn’t using high speed mode, although I have also tried this without success. Has anybody else had a similar problem? I can see the same behavior. What I see at baud is that the autobauding appears to be successful, but then the device echoes junk back in response to commands.

89C51RD2BN and Win XP

This tells me that baud almost works. Embedded Systems Academy, Inc. I run flash magic in win98 OS. My experiment tell me the best choice is: Are you using an ‘on the nose’ crystal such as Some general information regarding ISP and Because the high speed communications feature allows exact calculation of the baud rate to use, and because The reason it doesn’t is because in the past 89c51rd2vn have found using this feature, that if the daasheet 2 reload value is too high close to then it causes problems for the boot loader.


Therefore Flash Magic only uses timer 2 reload values that are lower than a certain threshold value that I have found results in reliable bootloader operation. In this case the dagasheet baudrate is Using a frequency such as Hence the highest reliable rate of baud is in my opinion likely. In general but not true for every specific case: Erik Yes, I run mostly in Future, I will test another 889c51rd2bn. The following test data is test result recently. I don’t promise the data is 89c51rd22bn corrective.

But, I will continue to test in future. Chip is any one: If you don’t understand the table. You will see the table in http: Hello All Thanks for the replies. I’ve tried using Flash Magic high speed comms with x12 clock checked and selected initially either or baud, and both failed part way through programming with an “unable to communicate” message box.

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I have even experienced failures sometimes at baud with no high speed comms enabled. Again, the failure is always part way through the hex file download in the programming cycle. In addition, I modified my own ISP programming applet to set the baud rate to using the direct load baud rate function timer 2 reload 89c51dd2bn 0xffee after auto bauding initially at The auto bauding seems to work ok i.


Up to the point of failure, all downloaded data is echoed back correctly – the next transmitted data record is not acknowledged at all.

ISP for P89LPC , 89C51RD2BN chips

The Xtal is a genuine I’ve run XP pro with Flash Magic as the only user application running and no virus checkers etc. I have, for that reason not downgraded from ’98 dafasheet XP. Several timing critical programs such as JTAG programmers and Parallel programmers work excellent under ’98 and very poorly under any downgrades from that.

You can access them in the Advanced Options. Please try increasing the values and see if that improves the reliability.