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MCP2150 bảng dữ liệu(PDF) 8 Page - Microchip Technology |
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MCP2150 bảng dữ liệu(HTML) 8 Page - Microchip Technology |
8 / 34 page MCP2122 DS21894B-page 8 Preliminary 2004 Microchip Technology Inc. 2.4.1 BAUD RATE The baud rate for the MCP2122 is determined by the frequency of the 16XCLK signal. Equation 2-1 demonstrates how to calculate the 16XCLK frequency based on the desired baud rate. Table 2-3 shows some common baud rates and the corresponding 16XCLK frequency. EQUATION 2-1: 16XCLK FREQUENCY TABLE 2-3: COMMON BAUD RATE/ 16XCLK FREQUENCY 2.5 Encoder/Decoder The IR encoder/decoder is made up of two major components. They are: • IR Decoder • IR Encoder The encoder receives UART data (bit by bit) and outputs a data bit in the IrDA standard bit format. Figure 2-8 shows a functional block diagram of the encoder. The decoder receives IrDA standard data (bit by bit) and outputs data in UART data bit format. Figure 2-8 shows a functional block diagram of the decoder. The encoder/decoder has two interfaces. They are: • Host UART interface •IR interface 2.5.1 ENCODING (MODULATION) Each bit time is comprised of 16 bit clocks. If the value to be transmitted (as determined by the TX pin) is a logic-low, the TXIR pin will output a low level for 7-bit clock cycles, a logic-high level for 3-bit clock (with a maximum high-time of about 4 µs) cycles, with the remaining time (6-bit clock cycles or more) being low. If the value to transmit is a logic-high, the TXIR pin will output a low level for the entire 16 bit clock cycle. 2.5.2 DECODING (DEMODULATION) 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 cycle (or a minimum of 1.6 µs), with the remaining time (13-bit clock cycles) being 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 cycle. The level on the RX pin will be in the appropriate state for an entire 16-bit clock cycle. FIGURE 2-8: MCP2122 RECEIVE DETECT TO ENCODER/DECODER BLOCK DIAGRAM Baud Rate 16XCLK Frequency (F16XCLK) Comment 9600 153,600 19,200 307,200 38,400 614,400 57,600 921,600 115,200 1,843,200 F16XCLK 16 (Desired Baud Rate) • = TXIR Glitch Filter Decode RX RXIR Pulse Width Limiter Encode TX The following table shows the state on the RESET pin and how this effects the operation of the TXIR pin. RESET State Comment VIH TXIR output encoded value of TX pin VIL TXIR is forced low (~ 4 µs) |
Số phần tương tự - MCP2150 |
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Mô tả tương tự - MCP2150 |
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