CEC1712 datasheet(127/338 Pages) MICROCHIP

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DS00003416C-page 127

CEC1712

TABLE 10-12: INTERRUPT CONTROL TABLE

FIFO

Mode

Only

Interrupt Identification

Interrupt SET and RESET Functions

Bit 3

Bit 2

Bit 1

Bit 0

Priority

Level

Interrupt Type

Interrupt Source

Interrupt Reset

Control

None

Highest

Receiver Line Sta-

tus

Overrun Error, Par-

ity Error, Framing

Error or Break

Interrupt

Reading the Line

Status Register

Second

Received Data

Available

Receiver Data

Available

Read Receiver Buf-

fer or the FIFO

drops below the

trigger level.

Character Timeout

Indication

No Characters

Have Been

Removed From or

Input to the RCVR

FIFO during the

last 4 Char times

and there is at least

1 char in it during

this time

Reading the

Receiver Buffer

Third

Transmitter Hold-

ing Register Empty

Transmitter Hold-

ing Register Empty

Reading the IIR

of Interrupt) or Writ-

ing the Transmitter

Holding Register

Fourth

MODEM Status

Clear to Send or

Data Set Ready or

Ring Indicator or

Data Carrier Detect

Reading the

MODEM Status

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