XR16C850 Datasheet, PDF(16/55 Page) Exar Corporation – UART with 128-byte FIFO’s FIFO Counters and Half-duplex Control

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XR16C850 Datasheet, PDF (16/55 Pages) Exar Corporation – UART with 128-byte FIFO’s FIFO Counters and Half-duplex Control

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XR16C850

SEL S3 S2 S1 A3-A9 COM Port Selected IRQ *2

0 0 0 0 3F8-3FF COM-1

0 0 0 1 2F8-2FF COM-2

0 0 1 0 3E8-3EF COM-3

0 0 1 1 2E8-2EF COM-4

IRQB (IRQ4)

IRQC (IRQ3)

IRQB (IRQ4)

IRQC (IRQ3)

0 1 0 0 3F8-3FF COM-1

0 1 0 1 2F8-2FF COM-2

0 1 1 0 3E8-3EF COM-3

0 1 1 1 2E8-2EF COM-4

IRQA (IRQn)

0 - - - 278-27F LPT-2

N/A

0 - - - 378-37F LPT-1

N/A

Table 2. PC MODE INTERNAL ADDRESS DECODE FUNCTIONS

Note *2: All interrupt outputs are inactive (three state mode) except when the selected address range is valid.

Rev. 1.20

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