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

Okay, KEELOQ, you're going to have to do a bit more reading.  The SIRCS protocol is documented all over the Internet -- go do a Google search and read up on it; that's what I did to write that demo for you.  If you happen to have Parallax's "IR Remote for the Boe-Bot" it's explained in there as well, though that book deals with decoding so you'll need additional information on encoding.

What you'll want to look for, specifically, is information on Sony's 12-bit protocol; the lower seven bits are called the command code, the upper five bits are called the device code; you have to load a word with the appropriate bits before transmitting.  The receiver code you cited (which I also wrote when I worked for Parallax) expects to receive 12 bits and splits them into the LSB and MSB of the return value.

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