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If I understand "The Explicit reg vars" correctly, this allows you to access the internal registers which are addressed by name in assembler, eg. r1. If I understand this correctly, it doesn't allow you to specify a memory mapped register. Is this correct? If this allows you to specify a memory mapped register, how do I implement it? Cheers, Roy ... > Roy> The code makes use of an IAR specific type called sfr - special function > Roy> register. Does anyone know of a similar type in gcc, or an easy way to > Roy> implement a similar type? > > Roy> A special function register is something like a UART control register, which > Roy> is at a predetermined address and can read/written to as a byte or as > Roy> individual bits. > >GCC allows you to specify for a variable what machine register it >should live in, I expect that that will do what you want. The >relevant technique is explained in the GCC documentation. The info >nnode you want is titled "Explicit Reg Vars". > > Roy Leonard Trintech Manufacturing Ltd Tel: +353 1 295 6766 Fax: +353 1 295 4735 aka: <leonardr@iol.ie> "Never Attribute to Malice that which can be adequately explained by stupidity!"