October 2002
Intermediate to advanced
430 pages
14h 57m
English
Content preview from Embedded Systems Design, 2nd Edition
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Basic peripherals 153
can also echo characters and it is possible to get four characters on
the terminal screen in response to a single key stroke.
Stop
1 2 3 4 5 6 7 8
StopStart
Start bit logical zero or space
Stop bit logical one or mark
Idle no tranmitted data
logical one or mark
Data bits
Asynchronous data format
The actual data format for the sequence is shown in the
diagram. When no data is transmitted, the TXD signal is set to a
logical one. When data is transmitted, a start bit is sent by setting
the line to a logical zero. Data is then sent by setting the data to a
zero or one accordingly and finally the stop bits are sent by forcing
the line to a logical ...
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