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ST16C1550 数据表(PDF) 9 Page - Exar Corporation |
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ST16C1550 数据表(HTML) 9 Page - Exar Corporation |
9 / 36 page xr ST16C1550/51 REV. 4.2.1 2.97V TO 5.5V UART WITH 16-BYTE FIFO 9 2.4 Programmable Baud Rate Generator The UART has its own Baud Rate Generator (BRG) with a prescaler. 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 clock output of the prescaler goes to the BRG. The BRG further divides this clock by a programmable divisor between 1 and (216 -1) to obtain a 16X 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 or a reset. Therefore, the BRG must be programmed during initialization to the operating data rate. Programming the Baud Rate Generator Registers DLM and DLL provides the capability of selecting the operating data rate. Table 2 shows the standard data rates available with a 14.7456 MHz crystal or external clock at 16X clock rate. When using a non-standard data rate crystal or external clock, the divisor value can be calculated for DLL/DLM with the following equation. FIGURE 4. TYPICAL OSCILLATOR CONNECTIONS divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 16) C1 22-47pF C2 22-47pF Y1 1.8432 MHz to 24 MHz R1 0-120 (Optional) R2 500K - 1M XTAL1 XTAL2 |
类似零件编号 - ST16C1550 |
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类似说明 - ST16C1550 |
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