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XR16V598IQ100 Datasheet(PDF) 8 Page - Exar Corporation |
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XR16V598IQ100 Datasheet(HTML) 8 Page - Exar Corporation |
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8 / 58 page  XR16V598 8 2.25V TO 3.6V HIGH PERFORMANCE OCTAL UART WITH 16-BYTE FIFO REV. 1.0.3 2.4 INT# Ouput The INT# interrupt output changes according to the operating mode and enhanced features setup. Table 2 and 3 summarize the operating behavior for the transmitter and receiver. 2.5 Crystal Oscillator The 598 includes an on-chip oscillator. The crystal oscillator provides the system clock to the Baud Rate Generators (BRG) in each of the 8 UARTs, the 16-bit general purpose timer/counter and internal logics. XTAL1 is the input to the oscillator or external clock buffer input with XTAL2 pin being the output. For programming details, see “Section 2.6, Programmable Baud Rate Generator with Fractional Divisor” on page 9. 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 (see Figure 3). Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal 8 baud rate generators for standard or custom rates. The typical oscillator connections are shown in Figure 3. For further reading on oscillator circuit please see application note DAN108 on EXAR’s web site. TABLE 2: INT# PIN OPERATION FOR TRANSMITTER Auto RS485 Mode FCR BIT-0 = 0 (FIFO DISABLED) FCR BIT-0 = 1 (FIFO ENABLED) NO HIGH = a byte in THR LOW = THR empty HIGH = FIFO above trigger level LOW = FIFO below trigger level or FIFO empty YES HIGH = a byte in THR LOW = transmitter empty HIGH = FIFO above trigger level LOW = FIFO below trigger level or transmitter empty TABLE 3: INT# PIN OPERATION FOR RECEIVER FCR BIT-0 = 0 (FIFO DISABLED) FCR BIT-0 = 1 (FIFO ENABLED) HIGH = no data LOW = 1 byte HIGH = FIFO below trigger level LOW = FIFO above trigger level FIGURE 3. TYPICAL OSCILLATOR CONNECTIONS C1 22-47pF C2 22-47pF 24 MHz XTAL1 XTAL2 R=300K to 400K |
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