MEC1322 Datasheet, PDF (154/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
Offset ^04h
Bits
Description
7:0 WRITE_CMD
This 8-bit register is write-only and is an alias of the register at offset
0h. When written, the C/D bit in the Keyboard Status Read Register
is set to ‘1’, signifying a command, and the IBF in the same register
is set to ‘1’.
Type
W
When the Runtime Register at offset 4h is read by the Host, it func-
tions as the Keyboard Status Read Register.
Default
0h
Reset
Event
VCC1_R
ESET
11.14.2 EC_HOST DATA / AUX DATA REGISTER
Offset ^00h
Bits
Description
7:0 READ_DATA
This 8-bit register is read-only. When read by the Host, the PCOBF
and/or AUXOBF interrupts are cleared and the OBF flag in the status
register is cleared.
Type
R
Default
0h
Reset
Event
VCC1_R
ESET
11.14.3 KEYBOARD STATUS READ REGISTER
This register is a read-only alias of the EC Keyboard Status Register.
Offset ^04h
Bits
Description
Type
7:6 UD2
R
User-defined data. Readable and writable by the EC when written
by the EC at its EC-only alias.
5 AUXOBF
R
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
R
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 (“0” = data, “1” = command). During a
Host command write operation (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”.
2 UD0
R
User-defined data. Readable and writable by the EC when written
by the EC at its EC-only alias.
Note: This bit is reset to ‘0’ when the LRESET# pin signal is
asserted.
Default
0h
Reset
Event
VCC1_R
ESET
0h
VCC1_R
ESET
0h
VCC1_R
ESET
0h
VCC1_R
ESET
0h
VCC1_R
ESET and
PCI
RESET#
DS00001719D-page 154
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