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PC87309VLJ датащи(PDF) 126 Page - National Semiconductor (TI) |
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PC87309VLJ датащи(HTML) 126 Page - National Semiconductor (TI) |
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126 / 192 page ![]() Enhanced Serial Port with IR -UART2 (Logical Device 2) 126 www.national.com 5.18.2 Infrared Transmitter Modulator Control Register (IRTXMC) This register controls modulation subcarrier parameters for Consumer-IR and Sharp-IR mode transmission. For Sharp- IR, only the carrier pulse width is controlled by this register - the carrier frequency is fixed at 500 KHz. After reset, the value of this register is 69h, selecting a car- rier frequency of 36 KHz and an IR pulse width of 7 µsec for Consumer-IR, or a pulse width of 0.8 µsec for Sharp-IR. Bits 4-0 - Modulation Subcarrier Frequency (MCFR) These bits set the frequency for the Consumer-IR mod- ulation subcarrier. The encoding are defined in Table 5-26. Bits 7-5 - Modulation Subcarrier Pulse Width (MCPW) Specify the pulse width of the subcarrier clock as shown in Table 5-27. TABLE 5-23. Consumer IR, High Speed Demodulator (RXHSC = 1) (Frequency Ranges in KHz) TABLE 5-24. Sharp-IR Demodulator (Frequency Ranges in KHz) TABLE 5-25. Consumer-IR, Low Speed Demodulator (RXHSC = 0) (Frequency Ranges in KHz) 76543210 Reset Required 1 0 0 1 0 1 1 0 Modulation Control (IRTXMC) Bank 7, Infrared Transmitter MCFR(4-0) Register MCPW(2-0) Offset 01h DFR Bits 4 3 2 1 0 DBW2-0 (Bits 7, 6 and 5 of IRRXDC) min/max 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 0 0 0 1 1 min 380.95 363.63 347.82 333.33 320.00 307.69 max 421.05 444.44 470.58 500.00 533.33 571.42 0 1 0 0 0 min 436.36 417.39 400.00 384.00 369.23 355.55 max 480.00 505.26 533.33 564.70 600.00 640.00 0 1 0 1 1 min 457.71 436.36 417.39 400.00 384.00 369.92 max 502.26 533.33 564.70 600.00 640.00 685.57 DFR Bits 4 3 2 1 0 DBW2-0 (Bits 7, 6 and 5 of IRRXDC) min/max 001 010 011 100 101 110 x x x x x x min 480.0 457.1 436.4 417.4 400.0 384.0 max 533.3 564.7 600.0 640.0 685.6 738.5 DFR Bits 4 3 2 1 0 DBW2-0 (Bits 7, 6 and 5 of IRRXDC) min/max 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 0 0 0 1 0 min 26.66 25.45 24.34 23.33 22.40 21.53 max 29.47 31.11 32.94 35.00 37.33 40.00 0 0 0 1 1 min 28.57 27.27 26.08 25.00 24.00 23.07 max 31.57 33.33 35.29 37.50 40.00 42.85 0 0 1 0 0 min 29.28 27.95 26.73 25.62 24.60 23.65 max 32.37 34.16 36.17 38.43 41.00 43.92 0 0 1 0 1 min 30.07 28.68 27.43 26.29 25.24 24.27 max 33.24 35.05 37.11 39.43 42.06 45.07 |
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