RC224ATLV 데이터 시트보기 (PDF) - Conexant Systems

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RC224ATLV

Embedded Modem Family

Conexant Systems 

RC224ATL/224ATLV

EmbeddedModem Family

2.0 Hardware Interface

2.1 Hardware Interface

Interrupt Identifier

Register (Addr = 2)

The Interrupt Identifier Register (IIR) identifies the existence and type of

prioritized pending interrupts. Four priority levels are set to assist interrupt

processing in the host.

When addressed during chip-select time, the IIR freezes the highest priority

interrupt pending and acknowledges no other interrupts until the particular

interrupt is serviced by the host.

7

6

5

4

3

2

1

0

0

0

0

0

0

PL1

PL0

IP

Bits 3-7:

PL0-1

IP

Not used (always 0).

Highest Priority Pending Interrupt. These two bits identify

the highest priority pending interrupt.

Priority

2

1

Level

Pending Interrupt

1

1

(highest) Receiver Line Status

1

0

2

Receiver Buffer Full

0

1

3

Transmitter Holding Register

Empty

0

0

4

Modem Status

Interrupt Pending. When this bit is a logic 0, an interrupt is

pending. When this bit is a logic 1, no interrupt is pending.

This bit can be used in a hardwired prioritized or polled

environment to indicate whether an interrupt is pending. If an

interrupt is pending, the IIR contents can be used as a pointer

to the appropriate interrupt service routine in the host.

D224ATLVDSC

Conexant

2-7

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