LAN9252SLASHML datasheet(56/329 Pages) MICROCHIP

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LAN9252

DS00001909A-page 56

 2015 Microchip Technology Inc.

8.2.6

DEVICE READY INTERRUPT

A device ready interrupt is provided in the top-level Interrupt Status Register (INT_STS) and Interrupt Enable Register

(INT_EN). The Device Ready (READY) bit of the Interrupt Status Register (INT_STS) indicates that the device is ready

to be accessed after a power-up or reset condition. Writing a 1 to this bit in the Interrupt Status Register (INT_STS) will

clear it.

In order for a device ready interrupt event to trigger the external IRQ interrupt pin, the Device Ready Enable

(READY_EN) bit of the Interrupt Enable Register (INT_EN) must be set and the IRQ output must be enabled via the

IRQ Enable (IRQ_EN) bit of the Interrupt Configuration Register (IRQ_CFG).

8.2.7

CLOCK OUTPUT TEST MODE

In order to facilitate system level debug, the crystal clock can be enabled onto the IRQ pin by setting the IRQ Clock

Select (IRQ_CLK_SELECT) bit of the Interrupt Configuration Register (IRQ_CFG).

The IRQ pin should be set to a push-pull driver by using the IRQ Buffer Type (IRQ_TYPE) bit for the best result.

8.3

Interrupt Registers

This section details the directly addressable interrupt related System CSRs. These registers control, configure and mon-

itor the IRQ interrupt output pin and the various device interrupt sources. For an overview of the entire directly address-

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