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XR16V2750_07 Datasheet, PDF (10/52 Pages) Exar Corporation – HIGH PERFORMANCE DUART WITH 64-BYTE FIFO | |||
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XR16V2750
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
REV. 1.0.2
2.8 INTA and INTB Outputs
The INTA and INTB interrupt output changes according to the operating mode and enhanced features setup.
Table 3 and 4 summarize the operating behavior for the transmitter and receiver. Also see Figures 17
through 22.
TABLE 3: INTA AND INTB PINS OPERATION FOR TRANSMITTER
Auto RS485
Mode
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1 (FIFO ENABLED)
INTA/B Pin
NO
LOW = a byte in THR
LOW = FIFO above trigger level
HIGH = THR empty
HIGH = FIFO below trigger level or FIFO empty
INTA/B Pin
YES
LOW = a byte in THR
LOW = FIFO above trigger level
HIGH = transmitter empty HIGH = FIFO below trigger level or transmitter empty
TABLE 4: INTA AND INTB PIN OPERATION FOR RECEIVER
INTA/B Pin
FCR BIT-0 = 0
(FIFO DISABLED)
LOW = no data
HIGH = 1 byte
FCR BIT-0 = 1
(FIFO ENABLED)
LOW = FIFO below trigger level
HIGH = FIFO above trigger level
2.9 Crystal Oscillator or External Clock Input
The V2750 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. Please note that the input XTAL1 is not
5V tolerant and so the maximum at the pin should be VCC. For programming details, see ââSection 2.10,
Programmable Baud Rate Generator with Fractional Divisorâ on page 11.â
FIGURE 4. TYPICAL OSCILLATOR CONNECTIONS
XTAL1
XTAL2
R2
500 Î⦠â 1 Îâ¦
R1
0-120 â¦
(Optional)
C1
22-47 pF
Y1
1.8432 MHz
to
24 MHz
C2
22-47 pF
10
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