DM6583 datasheet(12/43 Pages) ETC1

12 / 43 page

DM560P

V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set

Preliminary

Version: DM560P-DS-P07

August 11, 2000

Interrupt Identification Register (IIR): Address 2 (continued)

D3 D2

D0 Priority Level

Interrupt Type

Condition

Reset

Highest

Receiver Line

Status

Overrun Error, Parity Error,

Framing Error or Break

Interrupt

Reads the Line Status

Second

Receiver Data

Available

Receiver Data Available or

Trigger Level Reached

Reads the Receiver Buffer

Dropped Below the

threshold value

Second

Character Timeout

Indication

No characters have been

read from or written to the

Rx FIFO during

programming time interval,

and the Rx FIFO is not

empty

Reads The Receiver Buffer

Third

Transmitter

Holding Register

Empty

Ready to accept new data

for transmission

Reads the IIR Register or (if

source of interrupt) Writes

To The Transmitter Holding

Fourth

Modem Status

Clear to Send, Data Set

Ready, Ring Indicator or

Data Carrier Detected

Reads the Modem Status

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