If I use the ISD51 I have the following problems: 1. After the download (with FM)I'll change to the simulation. But I get the following message: -------------------------------------- "ISD51 Error" An error occured during programming the flash page at address 0x0080. The data on this flash page is probably corrupted. ------------------------------------ I have checked the flash. The program is OK. I think that the ISD51 works not correct. I use the P89LPC935FA. Can someone help me ? thanks