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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P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / Is there anyone who has used P89C662HBA
December 18, 2015, 12:04:25 AM
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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P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / Can't start ISP masked-ROM boot loader code ,P89C662HBA
November 19, 2015, 11:41:06 PM
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
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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