STFPC320 datasheet(53/78 Pages) STMICROELECTRONICS

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STFPC320

Remote control protocols

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15.3.1

RC-5 data 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 Philips RC-5 protocol, if the 5-bit ADDR field is “00000” and 6-bit command is

“000001”, the in decoded format the data on SDA pin will be sent as follows with MSB

transmitted first. S stands for Start Bit and T stands for Toggle Bit.

Figure 28.

RC-5 data structure in decoded format

15.3.2

RC-5 data 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 29.

RC-5 data structure in raw format

ADR

LSB

MSB

Byte 1

Byte 2

Byte 3

LSB

DAT

1-bit Start

bit

1-bit

Toggle Bit

5-bit Address

6-bit Command

MSB

LSB MSB

LSB

Data word

Sent first on SDA

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