MEC1404 Datasheet, PDF (266/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
16.15.2 EC2HOST DATA REGISTER
Offset ^0h
Bits
Description
7:0 EC2HOST_DATA
This register is an alias of the EC_HOST Data / AUX Data Regis-
ter. Writing this register sets the OBF status bit.
Type
W
Default
0h
Reset
Event
nSYSR
ST
16.15.3 EC KEYBOARD STATUS REGISTER
This register is an alias of the Keyboard Status Read Register. The fields C/D, IBF, and OBF remain read-only.
Offset ^04h
Bits
Description
Type
7:6 UD2
R/W
User-defined data. Readable and writable by the EC.
5 AUXOBF
R/W
Auxiliary Output Buffer Full. This bit is set to ‘1’ whenever the EC
writes the EC AUX Data Register. This flag is reset to ‘0’ when-
ever the EC writes the EC2Host Data Register.
4 UD1
R/W
User-defined data. Readable and writable by the EC when written
by the EC at its EC-only alias.
3 C/D
R
Command Data. This bit specifies whether the input data register
contains data or a command. During a Host command write oper-
ation (when the Host writes the HOST_EC Data / CMD Register at
offset 04h), this bit is set to ‘1’. During a Host data write operation
(when the Host writes the HOST_EC Data / CMD Register at off-
set 0h), this bit is set to ‘0’.
1=Command
0=Data
2 UD0
R/W
User-defined data. Readable and writable by the EC when written
by the EC at its EC-only alias.
This bit is reset to ‘0’ when the LRESET# pin signal is asserted.
Default
0h
0h
Reset
Event
nSYSR
ST
nSYSR
ST
0h
nSYSR
ST
0h
nSYSR
ST
0h
nSYSR
ST and
PCI_RE
SET#
DS00001956D-page 266
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