NOW, I still have a Good chip which I can Read device signature and bank check(Rxd,Txd,Gnd)
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#16
P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / Re: Can't start ISP masked-ROM boot loader code ,P89C662HBA
November 19, 2015, 11:50:06 PM #17
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