Advanced Micro Devices Corporation

Hock-Koon Lee

Bruce A Loyer

Melanie D Typaldos

A microcontroller employs an asynchronous serial port for predictably updating a baud divisor during data reception. A write enable to the baud counter ensures that the current value of the baud count in the baud counter is greater than a predetermined number of clocks so that the working baud divisor to be loaded from the working baud divisor register is stabilized. The working baud divisor register is updated during data reception by the serial port by a software write to a visible baud divisor register provided the working baud divisor in the working baud divisor register is not being used to load the baud counter. A working baud divisor register thereby maintains a value guaranteed to be stable by the time a baud counter needs to be reloaded. A visible baud divisor register and the baud counter can be on different, possibly asynchronous clocks.

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Singapore, Singapore

Hock-Koon Lee