Thank for your reply

I have done the following thing for 89lpc922.

I am using c ride compiler .I write a small program for display routing in c for checking the microcontroller.

In main loop call following assembly routine using pragma derivative for NO TOUCH.

#define PGM_MTP 0FF03H

if (!pgm_mode) // if port p0.3 is low
{
#pragma asm
mov 0A8H,#00H;
mov R0,#0ffH
mov @R0,#96H
mov A,#02H
mov R5,#01H
mov R7,#03H
lcall PGM_MTP
RET
END
#pragma endasm
}
But when I program the IC it will work for first time as factory default in program mode. But next time it does not go to program mode.

It any thing wrong in above program