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Messages - a9o1o8o

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P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / Re: P89C662HBA trouble
« on: January 17, 2016, 06:10:06 pm »
Can I erase the full chip through ISP this way?

2
A full device erase operating is always fail to me Now.Is there anyway to erase the full device but software handshake chip?

3
A full device erase should clear the security bits.but if you consure this chip is still useful to me?Is this chip still can download codes?

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P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / Re: P89C662HBA trouble
« on: January 14, 2016, 05:36:24 pm »
You mean that I cant't read chip‘s Identity number or BOOT VECTOR or STATUS BYTE's value?

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P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / Re: P89C662HBA trouble
« on: January 13, 2016, 10:32:06 pm »
I mean that just cant't read chip‘s Identity number or BOOT VECTOR or STATUS BYTE's value? if I set security bit

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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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OK,who can tell me set security bit1、 set security bit2 and set security bit3 meaning,if I choose any one when programming code,what will happen to MCU;

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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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May be bad chip Serial debugging assistant software Screen On,the last picture upload failed. The picture is stable data which is not "U"

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May be bad chip waveforms

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Good chip Serial debugging assistant software Screen

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because flash magic software so quickly that I can't capture waveforms in time ,so I use Serial debugging assistant software Send "U" persistent. The good chip will Reply "U". Good chip waveforms

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Debugging environment

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OK I'm sorry for that behavior,Both Txd and Rxd pin will light corresponding LED if there have data.When I want to reload my codes(PSEN Low,EA/P26/P27 High),Microcontrollers sometimes run my previous code to send stable data(such as "test program") through Txd pin and sometimes do nothing for a while and then run my previous code to send stable data through Txd pin  .But Rxd pin everytimes have data.And everytime fail to reload my codes.

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