AN2957

RC5 coding scheme

Doc ID 15550 Rev 2

5/21

2.1

Frame header description

The frame header is composed of three bits: The two first bits are start bits, which always

have the value "1". The next bit is a control bit, which is toggled every time a button is

pressed on the remote control transmitter (to determine whether a button is pressed and

held down, or pressed and released continuously).

Figure 4 and Figure 5 show examples of RC5 frame headers:

Figure 4.

Frame header 1

Figure 5.

Frame header 2

11

0

Head1 (1st press)

1

1

1

Head2 (2nd press)