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AN4099 Datasheet(PDF) 14 Page - STMicroelectronics |
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AN4099 Datasheet(HTML) 14 Page - STMicroelectronics |
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14 / 39 page  Infrared transmitter AN4099 14/39 Doc ID 023110 Rev 2 2.2.1 RC5 encoder solution RC5 encoding mechanism Figure 11 on page 14 shows how the RC5 frame is generated. The described flowchart is called during the TIM16 update interrupt routine. Figure 11. RC5 send frame flowchart In the Manchester encoding, a logic "0" is indicated by a 0 to 1 transition at the centre of the bit and a logic "1" is indicated by a 1 to 0 transition at the centre of the bit. The Manchester encoding rules are summarized in Figure 12. Figure 12. Manchester encoding bits Force the TIM16 Output1 to inactive level Begin send RC5 frame Increment BitsSent_Counter variable If the bit to be sent is 1 Force the TIM16 Output1 to active level Yes No End Generate the binary format of RC5 frame Transform the binary data frame from MSB to LSB Convert the binary data to a pulse width modulation format of the message Check if all bits are sent Yes No MS30804V1 Logical1 1.778 ms 1 0 Logical0 1.778 ms 0 1 MS30805V1 |
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