STFPC320 STMicroelectronics, STFPC320 Datasheet - Page 51

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

STFPC320
15.4
Note:
NEC remote control protocol
This remote control protocol uses pulse distance modulation. Each bit consists of a high
level of fixed time T, followed by a low level that varies in width. A space that is T represents
a logic “0” and a space that is 3T represents a logic 1. T is 0.56 ms.
The LSB is transmitted first as shown in
Figure 19. Pulse distance modulation
Figure 20. The transmitted waveform for NEC protocol
The above waveform is on the transmitted side. The received data by the STFPC320 after
the photo-diode is inverted from above.
First frame
Repeat frame
T = 0.56 ms
T = 0.56 ms
9 ms
First frame
108 ms
4.5 ms
LSB
9 ms
8-bit Address
Repeat frame
108 ms
T
T
Figure
Logic 0
Logic 0
MSB
T
T
LSB
20.
Inverted 8-bit
address
2.25 ms
T
T
MSB
LSB
Logic 1
Logic 1
8-bit command
0.56 ms
Remote control protocols
3T
3T
MSB
LSB
Inverted 8-bit
command
MSB
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