MEC1404 Datasheet, PDF (263/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

16.14.1 HOST_EC DATA / CMD REGISTER
MEC140X/1X
Offset ^0h
Bits
Description
Type
7:0 WRITE_DATA
W
This 8-bit register is write-only. When written, the C/D bit in the
Keyboard Status Read Register is cleared to ‘0’, signifying data,
and the IBF in the same register is set to ‘1’.
When the Runtime Register at offset 0h is read by the Host, it func-
tions as the EC_HOST Data / AUX Data Register.
Default
0h
Reset
Event
nSYSR
ST
Offset ^04h
Bits
Description
Type
7:0 WRITE_CMD
W
This 8-bit register is write-only and is an alias of the register at off-
set 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’.
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
nSYSR
ST
16.14.2 EC_HOST DATA / AUX DATA REGISTER
Offset ^0h
Bits
Description
Type
7:0 READ_DATA
R
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 sta-
tus register is cleared.
Default
0h
Reset
Event
nSYSR
ST
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DS00001956D-page 263