J: Hey, Goran is using the P89c51RB2. You refer to the Atmel, not the Philips data sheet.

Goran:
Philips has an appnote re ISP for the P89C51Rx2, read it. If you have a copy of WinIsp, trash it and get a copy of FlashMagic, free from www.esacademy.com. I do not understand why Philips keep pushing the inferior WinIsp, they paid Embedded Systems Academy to develop FlashMagic.

If you do not have my NoTouch document, send me an e-mail.

Erik