Useful links regarding Dallas micros The controllers I am currently looking into: Dallas DS80C320 and 323 Dallas DS87C530 Dallas DS89C420, 430 and 450 Below you will find links to various application notes and datasheets, which I recommend. Dallas/Maxim Application Note #75 Using the High-Speed Micro's Serial Ports http://www.maxim-ic.com/appnotes.cfm/appnote_number/547 Dallas/Maxim Application Note #89 High-Speed Micro Memory Interface Timing http://www.maxim-ic.com/appnotes.cfm/appnote_number/550 Dallas/Maxim Application Note #95 Interfacing the DS1307 with an 8051-Compatible Microcontroller http://www.maxim-ic.com/appnotes.cfm/appnote_number/492 Dallas/Maxim Application Note #3267 Using the Keil C Compiler with the DS89C420/430/440/450 http://www.maxim-ic.com/appnotes.cfm/appnote_number/3267 Dallas/Maxim Application Note #3477 Using the Free SDCC C Compiler to Develop Firmware for the DS89C420/430/440/450 Family of Microcontrollers http://www.maxim-ic.com/appnotes.cfm/appnote_number/3477 (C) Copyright 1997 - 2008 by Vault Information Services LLC. All Rights Reserved. Information provided "as-is" without warranty. Please see details. Contact us for usage and copy permission.