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XR16M580IM48 Datasheet(PDF) 11 Page - Exar Corporation |
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XR16M580IM48 Datasheet(HTML) 11 Page - Exar Corporation |
11 / 56 page XR16M580 11 REV. 1.0.0 1.62V TO 3.63V HIGH PERFORMANCE UART WITH 16-BYTE FIFO 2.6 Crystal Oscillator or External Clock Input The M580 includes an on-chip oscillator to produce a clock for the baud rate generators in the device when a crystal is connected between XTAL1 and XTAL2 as show below. The CPU data bus does not require this clock for bus operation. The crystal oscillator provides a system clock to the Baud Rate Generators (BRGs) in the UART. XTAL1 is the input to the oscillator or external clock buffer input with XTAL2 pin being the output. For programming details, see “Section 2.7, Programmable Baud Rate Generator with Fractional Divisor” on page 12. The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant, fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100ppm frequency tolerance) connected externally between the XTAL1 and XTAL2 pins. Typical oscillator connections are shown in Figure 7. Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate generator for standard or custom rates. The BGA package has XTAL1 only, the external clock is required. For further reading on oscillator circuit, see application note DAN108 on EXAR’s web site. FIGURE 7. TYPICAL CRYSTAL CONNECTIONS C1 22-47pF C2 22-47pF Y1 1.8432 MHz to 24 MHz R1 0-120 (Optional) R2 500K - 1M XTAL1 XTAL2 |
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