ENC28J60_12 datasheet(70/102 Pages) MICROCHIP

70 / 102 page

ENC28J60

DS39662E-page 70

 2006-2012 Microchip Technology Inc.

12.2

Wake-On-LAN/Remote Wake-up

Wake-On-LAN or Remote Wake-up is useful in conserv-

ing system power. The host controller and other

subsystems can be put in Low-Power mode and be

woken up by the ENC28J60 when a wake-up packet is

received from a remote station. The ENC28J60 must not

be in Power-Save mode and the transmit and receive

modules must be enabled in order to receive a wake-up

packet. The ENC28J60 wakes up the host controller via

the INT signal when the Interrupt Mask registers are

properly configured. The receive filter can also be set up

to only receive a specific wake-up packet (see

“Setup Steps for Waking Up on a Magic Packet”

shows the steps necessary in configuring the ENC28J60

to send an interrupt signal to the host controller upon the

reception of a Magic Packet.

12.2.1

SETUP STEPS FOR WAKING UP ON

A MAGIC PACKET

Set ERXFCON.CRCEN and ERXFCON.MPEN.

Service all pending packets.

Set EIE.PKTIE and EIE.INTIE.

Set up the host controller to wake-up on an

external interrupt INT signal.

Put the host controller and other subsystems to

Sleep to save power.

Once a Magic Packet is received, the EPKTCNT is

incremented to ‘1’, which causes the EIR.PKTIF bit to

set. In turn, the ESTAT.INT bit is set and the INT signal

is driven low, causing the host to wake-up.

ENC28J60 Datasheet(PDF) 70 Page - Microchip Technology