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

The [b]CLRB IND.1[/b] statement is actually clearing the associated bit in the "shadow" TRIS register for the port (SX/B saves this as you cannot read the TRIS registers in the SX28).  The next line, [b]MOV !RA, IND[/b], writes the shadow register to the TRIS port which makes the pin an output.  The [b]CLRB MidiOut[/b] is actually manipulating your serial pin.

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