Rainbow-electronics AT90LS4433 Manual de usuario descargar pdf (Pagina 120)

120

AT90S/LS4433

1042G–AVR–09/02

1. UART Loses Synchronization if RXD Line is Low when UART Receive is

Disabled

The UART will detect a UART start bit and start reception even if the UART is not

enabled. If this occurs, the first byte after reenabling the UART will be corrupted.

Problem Fix/Workaround

Make sure that the RX line is high at start-up and when the UART is disabled. An

external RS-232 level converter keeps the line high during start-up.

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