1. LPC24XX user manual;NXP B.V.,2008
2. Semiconductors;NXP,2008
3. ARM7TDMI Technical Reference Manual;ARM Ltd.,2001
4. Electrical Characteristics of Generators and Receivers for Use in Balanced Digital Multipoint Systems (ANSI/TIA/EIA-485-A-98);TIA,1998
5. Industrial communication networks – fieldbus specifications – part 3–3;IEC,2007