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Forum: µC & Digital Electronics Problem in Connection with AT89C51CC03


Author: Shaik Piebe (shaik)
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hallo all,

I have connect AT89C51CC03 to my PC.I had alredy Flip S/w installed.
I want to do ISP. After start AT89C51CC03 i press Reset and ISP 
simultaniasly and then first release Reset and then ISP.

After when i select AT89C51CC03 in Flip then it shows communication off.

please tell me abt this problem

thank u in advance.

Author: Ralf (Guest)
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Hello shaik,

your description isn't as informative as it should be. At least a 
circuit diagram would be helpful.
Also, the so called "hardware condition" for the bootloader is not only 
to pull-down /PSEN while releasing the reset signal, but also have EA 
pulled high. But without circuit diagram it's hard to say...

And, the problem could be related to the oscillator circuit -> have you 
checked if the oscillator is running?

Regards,

Ralf

Author: Ralf (Guest)
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> After when i select AT89C51CC03 in Flip then it shows communication off.
Do you really mean only selecting the device, or does the communication 
fail when you click on the connect button? (error message something like 
timeout error)

Regards,

Ralf

Author: ... (Guest)
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Look up the datasheet page 59, there's something on the conditions for 
the bootloader to start.
http://atmel.com/dyn/resources/prod_documents/doc4182.pdf

Author: Shaik Piebe (shaik)
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hallo Ralf,

thank u for reply.

how can i check oscillator is running..??

The Flip display no error, but also not select the device always display 
communicatio off.

Author: Ralf (Guest)
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> how can i check oscillator is running..??
Usually with a oscilloscope. I you don't have access to a oscilloscope, 
you can measure the voltage over the XTAL pins. If ~1/2 of MCU supply 
voltage is measured then the oscillator is running.

> The Flip display no error, but also not select the device always display
> communicatio off.
Not clear to me:

1. Select the device
2. Select the interface -> RS232 -> A dialog should open where you can 
choose the COM port and baudrate -> then click on "connect"

Did you made these steps?

Ralf

Author: Shaik Piebe (shaik)
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hallo Ralf,

thank u for ur reply.

i do that step.now it´s working.

i had wrong Flip software intalled so i faced this problem .

thank u for all ur reply.

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