STFPC320 查看數據表（PDF） - STMicroelectronics

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STFPC320

Front panel controller/driver with standby power management and real-time clock

STMicroelectronics 

Remote control protocols

STFPC320

15.4

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 31.

Figure 30. Pulse distance modulation

Logic 0

Logic 1

T = 0.56 ms

T

T

T

3T

Figure 31. The transmitted waveform for NEC protocol

108 ms

First frame

108 ms

Repeat frame

Note:

First frame

Repeat frame

9 ms

4.5 ms

8-bit Address

Inverted 8-bit

address

8-bit command

Inverted 8-bit

command

LSB

MSBLSB

MSBLSB

MSBLSB

MSB

0.56 ms

9 ms

2.25 ms

The above waveform is on the transmitted side. The received data by the STFPC320 after

the photo-diode is inverted from above.

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