Start bit detector and data strober for asynchronous receiver

摘要

An asynchronous data receiver is provided comprising a start bit detector which samples the received data at a clock rate which is a multiple of the data bit rate and analyzes a plurality of consecutive samples to distinguish an actual start bit from noise spikes, or the like. When receipt of an actual start bit has been confirmed, a bit rate clock source is started by the detector at mid-bit position of the start bit, whereby each of the data bits of a character is strobed at mid-bit time.