FAULT-TOLERANT SOFTWARE IN REAL-TIME SINGLE-CHIP MICROCONTROLLER SYSTEMS.

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Burnham, N.Q.
Cowling, C.F.
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COMPUTER SYSTEMS; DIGITAL - Fault Tolerant Capability - COMPUTERS; MICROPROCESSOR - Applications - TELEPHONE EXCHANGES; PRIVATE - Control Systems;
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Some of the techniques are described that can be advantageously used in designing highly fault-tolerant software for microcontroller-based systems. As an example, the design of software for a sophisticated PABX telephone exchange junction using 8-bit microcontrollers is described. Tests on the system under extreme noise conditions showed that with conventional software, significant unrecoverable errors occurred, whereas the same system operating with the fault-tolerant software proved extremely rugged. The general techniques outlined are applicable to any microcontroller-based system and should be considered for any system where software failure might prove hazardous.
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