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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87309VLJ датащи(PDF) 178 Page - National Semiconductor (TI) |
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PC87309VLJ датащи(HTML) 178 Page - National Semiconductor (TI) |
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178 / 192 page  Device Specifications 178 www.national.com 10.3.7 UART, Sharp-IR, SIR and Consumer Remote Control Timing 1. tBTN is the nominal bit time in UART, Sharp-IR, SIR and Consumer Remote Control modes. It is deter- mined by the setting of the Baud Generator Divisor registers. 2. tCWN is the nominal pulse width of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is determined by the MCPW field (bits 7-5) of the IRTXMC register at bank 7, offset 01h, and the TXHSC bit (bit 2) of the RCCFG register at bank 7, offset 02h. 3. tCPN is the nominal period of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is determined by the MCFR field (bits 4-0) of the IRTXMC register at offset 01h and the TXHSC bit (bit 2) of the RCCFG register at offset 02h. 4. tMMIN and tMMAX define the time range within which the period of the incoming subcarrier signal has to fall in order for the signal to be accepted by the receiver. These time values are determined by the content of register IRRXDC at bank 7, offset 00h and the setting of the RXHSC bit (bit 5) of the RCCFG register at bank 7, offset 02h. Symbol Parameter Conditions Min Max Unit tBT Single Bit Time in UART and Sharp-IR Transmitter tBTN − 25 1 tBTN + 25 nsec Receiver tBTN − 2% tBTN + 2% nsec tCMW Modulation Signal Pulse Width in Sharp-IR and Consumer Remote Control Transmitter tCWN − 25 2 tCWN + 25 nsec Receiver 500 nsec tCMP Modulation Signal Period in Sharp-IR and Consumer Remote Control Transmitter tCPN − 25 3 tCPN + 25 nsec Receiver tMMIN 4 tMMAX 4 nsec tSPW SIR Signal Pulse Width Transmitter, Variable (3/16) x tBTN − 15 1 (3/16) x tBTN + 15 1 nsec Transmitter, Fixed 1.48 1.78 µsec Receiver 1 µsec SDRT SIR Data Rate Tolerance. % of Nominal Data Rate. Transmitter ± 0.87% Receiver ± 2.0% tSJT SIR Leading Edge Jitter. % of Nominal Bit Duration. Transmitter ± 2.5% Receiver ± 6.5% UART tCMW tCMP Sharp-IR Consumer Remote Control tBT SIR tSPW |
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