78
of 2.25ms
Figure 5-13 Logical
“1”and Logical “0”
Figure 5-14
shows the frame of the protocol. Protocol will send a lead code first, a 9ms leading pulse
burst followed by a 4.5msThe second inversed data is sent to verify the accuracy of the information
received. At last, a final 562.5µs pulse burst to signify the end of message transmission.. Because every
time it is sent inversed data, the overall transmission time is constant.
Figure 5-14 Typical frame of NEC protocol
Note: IR Receiver receives the signal a inverted value(e.g. IR TX Controller send a lead code 9 ms high
then 4.5 ms low, IR Receiver will receive a 9 ms low then 4.5 ms high lead code).
IR Remote
When a key on the remote controller(See
Figure 5-15
) is pressed, the remote controller will emit a
standard frame, shown in
Table 5-6
The beginning of the frame is the lead code represents the start
bit, and then is the key-related information, and the last 1 bit end code represents the end of the
Summary of Contents for DE1-SOC
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