MEC1404 Datasheet, PDF (211/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
12.10.1 HOST-TO-EC MAILBOX REGISTER
Offset ^00h
Bits
Description
Type
7:0 HOST_EC_MBOX
8-bit mailbox used communicate information from the system host
to the embedded controller. Writing this register generates an
event to notify the embedded controller.
The embedded controller has the option of clearing some or all of
the bits in this register. This is dependent on the protocol layer
implemented using the EMI Mailbox. The host must know this pro-
tocol to determine the meaning of the value that will be reported on
a read.
This bit field is aliased to the HOST_EC_MBOX bit field in the
HOST-to-EC Mailbox Register.
12.10.2 EC-TO-HOST MAILBOX REGISTER
R/WC
Default
0h
Reset
Event
nSYSR
ST
Offset ^01h
Bits
Description
Type
7:0 EC_HOST_MBOX
R/W
8-bit mailbox used communicate information from the embedded
controller to the system host. Writing this register generates an
event to notify the system host.
The system host has the option of clearing some or all of the bits in
this register. This is dependent on the protocol layer implemented
using the EMI Mailbox. The embedded controller must know this
protocol to determine the meaning of the value that will be reported
on a read.
This bit field is aliased to EC_HOST_MBOX bit field in EC-to-
HOST Mailbox Register (EC_TO_HOST) on page 129 defined in
Section 10.10, "Runtime Registers".
Default
0h
Reset
Event
nSYSR
ST
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DS00001956D-page 211