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XR16L788 Datasheet(PDF) 9 Page - Exar Corporation |
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XR16L788 Datasheet(HTML) 9 Page - Exar Corporation |
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9 / 54 page  xr XR16L788 REV. 1.2.2 HIGH PERFORMANCE 2.97V TO 5.5V OCTAL UART 9 2.6 Programmable Baud Rate Generator A single Baud Rate Generator (BRG) is provided for the transmitter and receiver, allowing independent TX/RX channel control. The programmable Baud Rate Generator is capable of operating with a crystal frequency of up to 24 MHz. However, with an external clock input on XTAL1 pin and a 2K ohms pull-up resistor on XTAL2 pin (as shown in Figure 4) it can extend its operation up to 50 MHz (3.125 Mbps serial data rate) at room temperature and 5.0V. FIGURE 4. EXTERNAL CLOCK CONNECTION FOR EXTENDED DATA RATE Each UART has its own Baud Rate Generator (BRG) with a prescaler for the transmitter and receiver. The prescaler is controlled by a software bit in the MCR register. The MCR register bit-7 sets the prescaler to divide the input crystal or external clock by 1 or 4. The output of the prescaler clocks to the BRG. The BRG further divides this clock by a programmable divisor between 1 and (216 -1) to obtain a 16X or 8X sampling clock of the serial data rate. The sampling clock is used by the transmitter for data bit shifting and receiver for data sampling. The BRG divisor (DLL and DLM registers) defaults to a random value upon power up. Therefore, the BRG must be programmed during initialization to the operating data rate. FIGURE 5. BAUD RATE GENERATOR 2K XTAL1 XTAL2 R1 VCC External Clock vcc gnd XTAL1 XTAL2 Crystal Osc/ Buffer MCR Bit-7=0 (default) MCR Bit-7=1 DLL and DLM Registers Prescaler Divide by 1 Prescaler Divide by 4 16X or 8X Sampling Rate Clock to Transmitter and Receiver To Other Channels Baud Rate Generator Logic |
Similar Part No. - XR16L788 |
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Similar Description - XR16L788 |
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