I am Jitendra Batham,from Pune,i am doing project using philips Microcontroller P89c669,but it is creating problem while burning hex file,means it is giving ERROR which is "Unable to connect at the specified baud rate.Try reducing the baud rate,reset the hardware into the ISP mode again".
are you using Flash Magic (google is your friend)? If not, please do so. Another hint, given by the Error Message, did you try to reduce the baudrate to let's say 9600 baud?
On a side note, if you are doing a new project, you might want to check ARM Flash microcontrollers, available from the same (or other) companies.
If it's similar to the Dallas 89C450, then you have to select a baud rate according to the crystal connected to the P89c669!
So don't reduce it to 9600 because everyone uses 9600. Check the datasheet to select the correct baud rate!
Like rajeshkumar123 already said, do you initiate the boot loader in the correct way?
Correct levels on the correct pins?
With the Dallas I have to set three pins at a correct level.
Don't know with a P89C669
Here again check the datasheet.