I have a curious problem when I'm transmitting ASCII character '5' via 
RS232 to USART1.

It seems to be *alternately* receiving 0xB5 instead of 0x35, i.e. the 
MSB is erroneously set, about 50% of the time, and only seems to be 
failing on this character! (NB: WUE (wake-up enable bit) is disabled, 
which I know gives receive errors when enabled).

I've set USART1 up for asynchronous reception, 9600 baud, 8N1. I 
transmit from Hyperterminal into a USB-RS232 converter ("Prolific 
USB-to-Serial Comm Port").

I suspect flakiness in the converter, in absence of any other means of 
verifying its output, so will try masking the Rx'd MSB as a hack for 
now. But if anyone's got any bright ideas, please let me know.

Kind regards
Matt
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