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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP2140-IP датащи(PDF) 12 Page - Microchip Technology |
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MCP2140-IP датащи(HTML) 12 Page - Microchip Technology |
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12 / 58 page  MCP2140 DS21790A-page 12 Preliminary 2003 Microchip Technology Inc. 2.5.2 DECODER (DEMODULATION) The modulated signal (data) from the IR transceiver module (on RXIR pin) needs to be demodulated to form the received data (on RX pin). Once demodula- tion of the data byte occurs, the data that is received is transmitted by the MCP2140 UART (on the RX pin). Figure 2-6 shows the decoding of the modulated signal. Each bit time is comprised of 16-bit clocks. If the value to be received is a logic-low, the RXIR pin will be a low level for the first 3-bit clock cycles, or a minimum of 1.6 µs. The remaining 13-bit clock cycles (or difference up to the 16-bit clock time) will be high. If the value to be received is a logic-high, the RXIR pin will be a high level for the entire 16-bit clock cycles. The level on the RX pin will be in the appropriate state for the entire 16 clock cycles. 2.6 IR Port Baud Rate The baud rate for the MCP2140 IR port (the TXIR and RXIR pins) is fixed at the default rate of 9600 baud. The Primary device will be informed of this parameter dur- ing NDM. The Host UART baud rate and the IR port baud rate are the same. FIGURE 2-6: DECODING Note: The signal on the RX pin does not actually line up in time with the bit value that was received on the RXIR pin, as shown in Figure 2-6. The RXIR bit value is shown to represent the value to be transmitted on the RX pin. BITCLK RX RXIR Bit Value 01 0 0 0 1 ≥ 1.6 µs (up to 3 CLK) ≥ 13 CLK 16 CLK 16 CLK 16 CLK 16 CLK 16 CLK 16 CLK 16 CLK Start Bit Data bit 0 Data bit 1 Data bit 2 Data bit ... (CLK) RXPD RXPDREF |
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