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

Hi Steve,
I'm also fairly new to the SX chips, about a month into it. I found that the SX/B, and SXSim are great for getting up and running. Some tasks are well suited to SX/B coding. It is when you start to push the chip towards it's limits, custom VP's, precision timing, etc. that the asm is sometimes required. - I'm sure some of the coders on this board can push the limits in SX/B, but I found it easier to take total control with the asm. 

In any case, the debugging is at the asm level, so you will need to learn the opcodes, unless You write Bug Free code!

I would also suggest Gunther's book, "Programming the SX Microcontroller"  It is worth ever penny, and will walk you through asm code from simple to advanced.  The sections on software UART VP, and FIFO would drop right into you project. 

My 10 cents worth.
Larry

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