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XR16L788CQ Datasheet(PDF) 8 Page - Exar Corporation |
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XR16L788CQ Datasheet(HTML) 8 Page - Exar Corporation |
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8 / 54 page  XR16L788 xr HIGH PERFORMANCE 2.97V TO 5.5V OCTAL UART REV. 1.2.2 8 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 / BUFFER The 788 includes an on-chip oscillator (XTAL1 and XTAL2). 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” 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. Typically, the 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) INT# Pin NO HIGH = a byte in THR LOW = THR empty HIGH = FIFO above trigger level LOW = FIFO below trigger level or FIFO empty INT# Pin 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) INT# Pin 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 14.7456 MHz XTAL1 XTAL2 R=300K to 400K |
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