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fine dude,thanks for helping...i tried to program it in this way
erase boot block
load the bootloader file of the specific muc
program it in the boot block....
i guess the address for boot block is different than the user code block in philips muc coz in all our programs,if the code is small,we...
solved....actually not really the way you said but by changing the muc altogether :) there was something wrong with my muc (i guess the boot blocks are corrupted) i also guess that psen needs to be lower in case of atmel mucs only coz my new muc worked without it too....now i need to figure out...
i tried sending 'U' but it didnt respond...PSEN line is open and RST is controlled by a switch on the board (initially high but goes low when switch is pressed)...rxd and txd are connected to max 232 circuit on board.....p2.6 and 2.7 are open but as far as i know,they are address lines right,so...
I purchased 4 new NXP P89v51rd2 ics from a reputed shop and none of them are programming via ISP. the flash magic screen waits indefinitely in "reset into ISP mode now".even the device id is not visible. serial communication loopback occurs perfectly from pc via max ic via the short on txt rxd...
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