4 May
2004
4 May
'04
4:28 p.m.
[...serial-line break condition...]
A break consists of making the transmit data
pin +ve for 200ms (or
whatever). In fact the normal way to detect a break at the
receiving end on a
modern system is to look for a framing error detected by the UART
chip -- this means the received character didn't have valid stop
bits, which is the case for a true line break.
A few (better) serial-interface chips detect and report a break
condition as distinct from other framing errors. (Some of them
consider "break" as a subclass of "framing error" - I mean that they
allow the host to tell the difference between a break and a non-break
framing error.)
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