MEC1322 Datasheet, PDF (156/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
11.15.1 HOST2EC DATA REGISTER
Offset ^0h
Bits
Description
7:0 HOST2EC_DATA
This register is an alias of the HOST_EC Data / CMD Register.
When read at the EC-Only offset of 0h, it returns the data written by
the Host to either Runtime Register offset 0h or Runtime Register
offset 04h.
Type
R
Default
0h
Reset
Event
VCC1_R
ESET
11.15.2 EC DATA REGISTER
Offset ^0h
Bits
7:0 EC_DATA
Description
Type
W
Default
0h
Reset
Event
VCC1_R
ESET
11.15.3 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
7:6 UD2
User-defined data. Readable and writable by the EC.
5 AUXOBF
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’ whenever
the EC writes the EC Data Register.
4 UD1
User-defined data. Readable and writable by the EC when written
by the EC at its EC-only alias.
3 C/D
Command Data. This bit specifies whether the input data register
contains data or a command. During a Host command write opera-
tion (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 offset
0h), this bit is set to ‘0’.
Type
R/W
R/W
R/W
R
Default
0h
0h
Reset
Event
VCC1_R
ESET
VCC1_R
ESET
0h
VCC1_R
ESET
0h
VCC1_R
ESET
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.
0h
VCC1_R
ESET and
PCI
RESET#
DS00001719D-page 156
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