STFPC320 STMicroelectronics, STFPC320 Datasheet - Page 49

• Manufacturer Part Number: STFPC320
• Description: Front Panel Controller/driver With Standby Power Management And Real-time Clock
• Manufacturer: STMicroelectronics

STFPC320
15.3
Philips RC-5 remote control protocol
The RC-5 remote control protocol is based on bi-phase (aka Manchester) coding as shown
in
the STFPC320 after reception by the photo diode will be inverted of below. The MSB is
transmitted first.
Figure 16. Bi-phase coding
Figure 17. RC-5 protocol frame
Figure 18. Example of RC-5 transmission
For RC 5 data transmission, a binary 1 is represented by a low to high transition and a
binary 0 is represented by a high to low transition from the IR transmitter.
The first two start bits (S1 and S2) are sync bits. For normal operation, they are always set
to “11” on the transmit side. After the photo-diode, there is one inversion. So the data at the
IR_DATA_IN of the STFPC320 will be inverted of above. The next bit is the toggle bit. This
bit is inverted each time a key on the remote control is pressed. Bits A1..A5 are the address
bits. The address bits indicate the intended application that the remote control protocol is
used for. Bits C1..C6 are the command bits. The command bits instruct what action is to be
taken.
Figure
Data word
16. Note that the coding is on the transmitted side. The data on IR_DATA_IN pin of
Data word
24.9 ms
1
1 1
1
1 1
0
0 0
2-bit Start
bits
114 ms
0
0 0
Logic 1
1.776ms
0
0 0
Toggle Bit
1-bit
1
1 1
Data word
0
0 0
MSB
1
1 1
Logic 0
1.776ms
5-bit Address
1
1 1
1
1 1
LSB MSB
0
0 0
Remote control protocols
1
1 1
6-bit Command
Data word
0
0 0
1
1 1
LSB
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