Software-Controlled Mode

The LED bit in IRCNT register is provided for software generated IR formats. This bit is OR-ed with the output of the REDEYE formatter, and the other IR format outputs. Therefore, two IR formats may not be used simultaneously.

Due to LED current limitations, the LED output driver duty cycle must be limited to a time average of 29%. The duty cycle is automatically limited to 1/2 x 8/14 or 28.6% by the REDEYE formatter. The format of a full REDEYE frame yields a duty-cycle of only 14.3%. If a different format is used (by using the LED bit) software must limit the duty-cycle.