Expert System Designer Certificate from Motorola
I designed a digital time control clock for use in a spa pool control system using a Motorola (became Freescale, now NXP) 68HC705J1A microcontroller. This was programmed in assembly language and carried out triple redundant timekeeping in software so that, if interference disturbed one of the timekeeping processes, it could recognise the problem by comparing the three separately maintained times. This allowed it to reject the error and carry on working with the correct time in a “fail operational” manner.
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