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.
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
> 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
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
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.
> 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
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.