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Topics - a9o1o8o

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P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / P89C662HBA trouble
« on: January 13, 2016, 10:23:36 pm »
 OK,if I  set  security bit1 or set security bit2 or set security bit3(May be set all three security bit )when download my code to P89C662HBA,Does it will cause I can't  Handshake to MCU successuflly next time?Who can help me?

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Is there anyone who has used P89C662HBA?Please teld me your way of programming code by serial port or parallel tool.Thank very much.

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I need help about NXP MCU,P89C662HBA,which can start user's code but can't start ISP masked-ROM boot loader code.But why?even though I push PSEN pin to GND. when I want to down load my code,I have to push PSEN pin to GND in order to start ISP masked-ROM boot loader code,after a few sucess times,Now,fail to start boot loader code ,so I can't down load my code using this way. what's wrong my Behavior? I need Help.

I Push EA to VCC and PSEN to GND directly,Push ALE,P2.6,P2.7 to VCC through pull-up resistor,But I still can't down load my code

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