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Messages - a9o1o8o

#1
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?
#4
You mean that I cant't read chip's Identity number or BOOT VECTOR or STATUS BYTE's value?
#5
I mean that just cant't read chip's Identity number or BOOT VECTOR or STATUS BYTE's value? if I set security bit
#6
 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?
#7
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;
#8
Is there anyone who has used P89C662HBA?Please teld me your way of programming code by serial port or parallel tool.Thank very much.
#9
May be bad chip Serial debugging assistant software Screen On,the last picture upload failed. The picture is stable data which is not "U"
#11
Good chip Serial debugging assistant software Screen
#12
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
#15
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.