Hi PIClisters, I am able to use the USER EEPROM WRITE and READ through a PIC. Has anybody used the PIC code LEARN MODE ACTIVATION with HCS500 ? I am having difficulty in communicating with HCS 500 for LEARN MODE ACTIVATION and I have a product release tomorrow. Code snippet is welcome. Thanks in advance. Pailoor -- ================================================= For Embedded Controls Solutions and Custom Designs CHIP TECHNOLOGIES - Member, Microchip Consultant Program Bangalore - INDIA Email : chiptech@vsnl.com Webpage : http://business.vsnl.com/chiptech ( updated 16th April 1999 )