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Greetings, I have a project idea to control SCRs connected to three phase electric heater. I need to know which phase is behind and which phase is ahead with respect to selected/chosen phase. IMO, three pins with interrupts attached to them may satisfy the need. Each interrupt will be driven/triggered by seperate zero crossing circuits. After deciding which phase leading which one lagging, I may be capable to fire the SCRs at desired angles. Could someone tell me which msp430gXYZ chip is suitable for the job and has available (more than one) interrupt pins? I am a mechanical engineer by education. So, feel free to criticise my approach with terms of electrics discipline. Murat