Hi swinkels sorry for late reply, im just back from holiday. Im using TDA1543, i buy it from futurlec.com. I dont able to re-program the fuse bit config. im using pony prog with stk200 simplified. It always show "device missing or invalid". Please tell me how can I re-program it? are stk200 need external vcc? and what fuse bit should i tick? here I attached the recorded testone. and sorry for my english.. thanks before it testone2.rar