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ST16C2552 데이터시트(PDF) 9 Page - Exar Corporation |
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ST16C2552 데이터시트(HTML) 9 Page - Exar Corporation |
9 / 35 page áç áç áç áç ST16C2552 REV. 4.2 2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO 9 2.7 INTA and INTB Ouputs The INTA and INTB interrupt outputs change according to the operating mode and enahnced features setup. Tables 3 and 4 summarize the operating behavior for the transmitter and receiver. Also see Figures 16 through 21. 2.8 Crystal Oscillator or Ext. Clock Input The 2552 includes an on-chip oscillator (XTAL1 and XTAL2) to produce a clock for both UART sections in the device. The CPU data bus does not require this clock for bus operation. The crystal oscillator provides a system clock to the Baud Rate Generators (BRG) section found in each of the UART. XTAL1 is the input to the oscillator or external clock buffer input with XTAL2 pin being the output. See “Programmable Baud Rate Generator” on page 10. FIGURE 4. TYPICAL OSCILLATOR CONNECTIONS 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 2), with an external 500k Ω to 1 M Ω resistor across it. Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate generator for standard or custom rates. Typical oscillator connections are shown in Figure 4. For further reading on oscillator circuit please see application note DAN108 on EXAR’s web site. TABLE 3: INTA AND INTB PINS OPERATION FOR TRANSMITTER FCR BIT-0 = 0 (FIFO DISABLED) FCR BIT-0 = 1 (FIFO ENABLED) INTA/B Pin 0 = a byte in THR 1 = THR empty 0 = at least 1 byte in FIFO 1 = FIFO empty TABLE 4: INTA AND INTB PIN OPERATION FOR RECEIVER FCR BIT-0 = 0 (FIFO DISABLED) FCR BIT-0 = 1 (FIFO ENABLED) INTA/B Pin 0 = no data 1 = 1 byte 0 = FIFO below trigger level 1 = FIFO above trigger level C1 22-47 pF C2 22-47 pF Y1 1.8432 MHz to 24 MHz R1 0-120 Ω (Optional) R2 500 ΚΩ−1ΜΩ XTAL1 XTAL2 |
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