HELP me...
i have a P89C51RD+JB (44-Pin Plastic Quad Flat Pack-PQFP) solder on a development board. on the board, it have ISP or ICP (i not sure:P) circuit for serial programming.
there is a jamper to put it into ISP, I have no problem using Flash Magic to programming the chip. normally i choose Erase all flash when programming it.
But untill this morning,when i doing the same thing, i programming the board using Flash Magic, in the middle of Erasing process,my RX TX connector lose out (i mean disconnected from PC) and programming process is stoped. after that i'm not able to do ISP again.
normally when I put the jumper to ISP mode, it will not executing the code, but now even the board are in ISP mode, it still executing the code, running the program, and I not able to connect it to PC to re-program the chip....please help me...
any solution to make it ISP programable again,other the take it out from board and use parallel programmer.
if not choice, then can i connect the parallel programmer pinout to the chip with the chip still on the circuit to program it. i don't have the skill the take the chip out from that board and I don't have parallel programmer that program PQFP.
hope to hear from you guys soon, thanks in advance.
Jesper.