Well Iam successfully able to load my program to AT89C51 IC howevr iam not able to retrive the data. When I checked the PSEN pin the its low even after programming the flash insideis not transmittinmg and data... KINDLY help....
yes iaam not abel to get the dat stored in internal flash in the AT89C51ed2 IC
I need Hardware design guide lines like filter capacitors on 89c51 ed2 .. what should be its value..
i have lost many of my m,icrocontrollers for the same reason .. its programmong but the dat iam not able to retrieve... Kindly give me HARDWARE spec regarding the same
If you cant't connet to AT89C51ED2 bootloader with FLIP, the problem may be with PSEN condition during "reset". On some MCU (abbout 10 % of MCU's) must be strictly observed PSEN condition during "reset". I quote datasheet: "The Hardware conditions (EA = 1, PSEN = 0) during the Reset# falling edge force the on-chip bootloader execution. As PSEN is a an output port in normal operating mode after reset, user application should take care to release PSEN after falling edge of reset signal. The hardware conditions are sampled at reset signal falling edge, thus they can be released at any time when reset input is low. ". I have special "add-om" hardware unit to start bootloader on some MCU ...
Martin Thank u for the reply , but can u PLS explain in detail using a schematic of AT89C51ED2 chip.