ENC28J60T-CSLASHML datasheet(72/96 Pages) MICROCHIP

72 / 96 page

ENC28J60

DS39662B-page 70

Preliminary

12.2

Wake-On-LAN/Remote Wake-up

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

serving 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

for

available

options).

Section 12.2.1 “Setup Steps for Waking Up on a

Magic Packet” shows the steps necessary in configur-

ing 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.

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