CP2201 datasheet(30/108 Pages) SILABS

30 / 108 page

CP2200/1

Rev. 1.0

8. Interrupt Sources

The CP2200/1 can alert the host processor when any of the 14 interrupt source events listed in Table 12 triggers

an interrupt. The CP2200/1 alerts the host by setting the appropriate flags in the interrupt status registers and

driving the INT pin low. The INT pin will remain asserted until all interrupt flags for enabled interrupts have been

cleared by the host. Interrupt flags are cleared by reading the self-clearing interrupt status registers, INT0 and

INT1. Interrupts can be disabled by clearing the corresponding bits in INT0EN and INT1EN.

If the host processor does not utilize the INT pin, it can periodically read the interrupt status registers to determine

if any interrupt-generating events have occurred. The INT0RD and INT1RD read-only registers provide a method

of checking for interrupts without clearing the interrupt status registers.

Table 12. Interrupt Source Events

Event

Description

Pending

Flag

Enable

Flag

End of Packet

The last byte of a packet has been read from the

receive buffer using the AutoRead interface.

INT0.7

INT0EN.7

Receive FIFO Empty

The last packet in the receive buffer has been unloaded

or discarded.

INT0.6

INT0EN.6

Self Initialization Complete

The device is ready for Reset Initialization. See “6.2.

Reset Initialization” on page 18.

INT0.5

INT0EN.5

Oscillator Initialization Complete The external oscillator has stabilized.

INT0.4

INT0EN.4

Flash Write/Erase Complete

A Flash write or erase operation has completed.

INT0.3

INT0EN.3

Packet Transmitted

The transmit interface has transmitted a packet.

INT0.2

INT0EN.2

Receive FIFO Full

The receive buffer is full or the maximum number of

packets has been exceeded. Decode the RXFIFOSTA

status register to determine the receive buffer status.

INT0.1

INT0EN.1

Packet Received

A packet has been added to the receive buffer.

INT0.0

INT0EN.0

“Wake-on-LAN” Wakeup Event

The device has been connected to a network.

INT1.5

INT1EN.5

Link Status Changed

The device has been connected or disconnected from

the network.

INT1.4

INT1EN.4

Jabber Detected

The transmit interface has detected and responded to a

jabber condition. See IEEE 802.3 for more information

about jabber conditions.

INT1.3

INT1EN.3

Auto-Negotiation Failed

An auto-negotiation attempt has failed. Software should

check for a valid link and re-try auto-negotiation.

INT1.2

INT1EN.2

Reserved

Auto-Negotiation Complete

An auto-negotiation attempt has completed. This inter-

rupt only indicates completion, and not success. Occa-

sionally, Auto-Negotiation attempts will not complete

and/or fail; therefore, a 3 to 4 second timeout should be

implemented. A successful auto-negotiation attempt is

one that completes without failure.

INT1.0

INT1EN.0

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