Right.
>Why is there any need to 'indicate' the end of a character? It is always
>the same length.
The stop bit is there to allow the detection of the start bit....
The start bit has a binary value of '0'. If there was no stop bit (which
by the way has a binary value of '1'), the receiver would have a problem
when the last bit of a character would be a '0': there would be no
transition at the beginning of the start bit of an immediatly following
character, and hence no opportunity to resync the bit clock.
One could argue that the bit clock could be resynchronised on any
transition. This would still not solve the problem when a long string
of zeroes is sent. With the start and the stop bit, you always have
a guaranteed one and a guaranteed zero for ten (or eleven) transmitted
bits.
/AF
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