Computer Interfacing

Computer interfacing

The fact that each of the above types of error is flagged

at an external pin of the 6402 allows the system designer

to initiate an error correction procedure, such as the re-

transmission of the character that caused the error.

There are two ways in which a UART can be used, known

as the unconditional and handshaking modes. In the case

of the former, the idea is that any time a character ar-

rives it gets handled. This is simple but carries the

reservation that the rate at which such characters ar-

rive must be limited according to the selected Baud rate.

In the handshaking mode the UART decides, by means of

control signals ...