STFPC320 datasheet(57/78 Pages) STMICROELECTRONICS

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STFPC320

Remote control protocols

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15.5.1

Sony 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 Sony protocol, if the 5-bit custom code is “11000” and 7-bit data code is

“1010100”, the in decoded format the data on SDA pin will be sent as follows with MSB

transmitted first.

Figure 35.

Sony data structure in decoded format

15.5.2

Sony 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. If a valid SYN pulse is detected, it is

represented by a bit ‘1’. So a first bit with value ‘1’ implies that the data following it is a valid

raw format RC data. So for the above example for Sony protocol, the data on SDA pin in

raw-format will be as in Figure 36.

Figure 36.

Sony data structure in raw format

MSB

LSB

MSB

LSB

Byte 1

Byte 2

Byte 3

ADR

DATA

Custom code

5-bit

Data code

7-bit

LSB

MSB

LSB

MSB

Sent first on SDA

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