hi all... i am working on a project where i have to use SMD 44 pin TQFP SST89E516RD2 microcontroller. i am using TTL converter to program this controller using RX and TX pins. but i am not able to program the controller. i am using flash magic to program. when i press start button from the software it says RESET TO ENTER ISP MODE. but when i reset the controller, nothing happens. i have checked all the connection and also the connectivity. connected RX pin to controller TX pin and TX to controller RX pin. also only TX led glows in TTL converter. i tried changing around 4 boards but non of them are working. but the same if i try programming the DIP package, it programmes without any error.
I have made a small testing using hyper terminal. using 40 pin DIP package, when i send 'U' from hyper terminal to the controller the controller response to it but the same when i use 44 pin SMD TQFP package and send 'U' to the controller using different baud rate from 9600 to 1200 the controller does not responds any thing. i have tried the same to all of my 4 boards. but none of them gave me any positive results.