In SX Microcontrollers, SX/B Compiler and SX-Key Tool, davehein wrote:

Shaun,

With optimized code you could transfer data at a rate of 5 to 10 cycles per bit.  It depends on whether you use loops or straight-line code.  At 10 cycles/bit your data transfer rate would be 5 M-bits/s at 50 MHz.  Since you only need to handle 640 Kbps your processor clock could be as low as 6.4 MHz.  I assume you want to do something with the data, so you would need a higher clock rate to handle the extra cycles for processing.

If you run asynchronously the sender and the receiver transfer rates must be within a percent or so of each other.  If your willing to use an extra line for a clock you could run synchronous at very high rates as Peter mentioned.  In that case you wouldn't have to worry about the accuracy of the transmitter and receiver clocks.

Dave

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