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This is called the channel out instruction. It results in a variable number of bytes being sent to the peripheral. The data is taken from U starting at U(0). The number of bytes transferred is determined by V, and must be between 0 and 20.
There are 16 allowable command codes, so this instruction could address 16 destination registers, for example display lines on a text display. The channel out instruction was designed with LCD displays in mind, but will be useful wherever a variable data length is required or one that is more than 4 bytes long.
The peripheral will respond with a True or a False. This will be saved in U(0).
This is a low-level instruction associated with the SPLat Expansion Framework. You will most likely never need to know how to use it.
See also Error handling in SPx transfer instructions
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