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This is called the Channel In instruction. It results in a variable number of bytes being sent by the peripheral and stored in U starting at U(0). The number of bytes transferred is determined by the peripheral, and will be between 0 and 20. The byte count is stored in V.
There are 16 allowable command codes, so this instruction could address 16 long source registers, for example display lines on a text display.
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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