Panasonic KX-TCD455GM Service Manual

28. EEPROM LAYOUT (BASE UNIT)28.1. ScopeThe purpose of this section is to describe the layout of the EEPROM (IC1) for the KX-TCD455Base Unit.The EEPROM contains hardware, software, and user specific parameters. Some parameters areset during production of the base e.g. crystal frequency adjustment at address 0000 and 0001,some are set by the user configuration e.g. ringer volume at address 0220, and some are setduring normal use of the phone e.g. meter pulse billing at address 0140..015F.28.2. IntroductionThe base unit uses a 32K bit serial EEPROM (IC1) for storing volatile parameters. All parametersare set up before the base leaves the factory. Some of these are vital for the operation of thehardware so a set of default parameters is programmed before the actual hardware fine-tuningcan be initiated. This document lists all default settings with a short description.In the tables below values in a range that are similar are not repeated; i.e. Address 00 to 01contains the value 00 simply means that the value 00 is repeated in all addresses in the range.All values in this document are in hexadecimal notation.Type Name DescriptionD default The EEPROM location is preset to the Default value by the eeprom defaultA adjust The EEPROM location is set during the production test and should not beoverwritten. The value is set by the eeprom default loader only if the locationcontains all 1’s (byte: 0xFF, word FFFFh), i, e. it has never been set.- EEPROM location which is not set at all.d default Same as D but best-guess value and/or not verified.CountrySettingx Default - no specific country setting, so revert to default value28.3. EEPROM Layout28.3.1. General Setup77