STFPC320 datasheet(54/78 Pages) STMICROELECTRONICS

Part #	STFPC320

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

PDF	78 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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54 / 78 page

Remote control protocols

STFPC320

54/78

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

Figure 31.

The transmitted waveform for NEC protocol

Note:

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

the photo-diode is inverted from above.

Logic 0

Logic 1

T3T

T = 0.56 ms

Logic 0

Logic 1

T3T

T = 0.56 ms

First frame

Repeat frame

8-bit command

Inverted 8-bit

command

9 ms

4.5 ms

8-bit Address

Inverted 8-bit

address

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

9 ms

2.25 ms

0.56 ms

First frame

Repeat frame

108 ms

STFPC320 Datasheet(PDF) 54 Page - STMicroelectronics

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