STFPC320 datasheet(55/78 Pages) STMICROELECTRONICS

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STFPC320

Remote control protocols

55/78

15.4.1

NEC in decoded format

In the decoded form, the ADR bits followed by Start bit and Toggle Bit followed by Data bits

are sent in this order for each remote control protocol. The number of bits depends on the

corresponding RC protocol. The remaining empty bits are stuffed with 1’s to complete a

byte-aligned data frame.

Example for NEC protocol, if the 8-bit ADDR field is “00000010” and 8-bit command is

“00011111”, the in decoded format the data on SDA pin will be sent as follows with MSB

transmitted first.

Figure 32.

NEC data structure in decoded format

15.4.2

NEC in RAW format

In the raw form, the data is sent in the same way as it is received for each RC protocol

except that the header is not transmitted on SDA. So for the above example for Philips RC-5

protocol, the data on SDA pin in raw-format will be as follows:

Figure 33.

NEC data structure in raw format

MSB

LSB

MSB

LSB

Byte 1

Byte 2

Byte 3

ADR

DATA

8-bit command

Inverted 8-bit

command

8-bit Address

Inverted 8-bit

address

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

Sent first on SDA

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