June 2014
Beginner to intermediate
208 pages
7h 14m
English
Content preview from Computer Interfacing
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Computer interfacing
Serial data in and out are via the pins RxD and TxD; these
are TTL compatible signals, but they will invariably re-
quire external buffering to interface them to the serial
devices. The modem-control lines control the interface
in an RS232C modem link. There are two clocks, one for
receive and one for transmit and, as explained previ-
ously, they may be different for the two directions, thus
providing different Baud rates.
The
8251
USART
This device, the block diagram for which appears in Fig-
ure 5.5, permits both synchronous and asynchronous
serial data transmission. The latter method has been
described already and it shoul ...
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