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Messages - Tony G

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Old Topics / Parallel Programmer
« on: August 03, 2004, 12:39:26 am »
can anyone recommend a cheap parallel programmer for the P89C51RD2HBP.
Required for re-programming the boot loader.

Tony G.

Help please:
I have tried program the P89C51RD2 using an application note which suggested the use of DTR and CTS of the RS232C port. This did not work and I have followed procedures for power up of Vpp and PSEN.
I have been able to program the part using just the RX and TX. However the part insists on setting the FX2 bit and forces the micro to work in the 6 clock mode. Among other possible effects is that the baud rate generator now works at 2 times the rate. Using just TX and RX I have not been able to get FlasMagic to program for 12 clock mode.
I have tried to alter the CKCON register with the user code but am unable to read of alter this register. CKCON always returns FFh.
The user code works because I have used the same code on an ATMEL 89C51RD2 and I am able to read this register and alter it.

Any suggestions?


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