MEC1322 Datasheet, PDF (137/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
Offset ^04h
Bits
Description
Type
4 BURST
R
The BURST bit is set when the ACPI_EC is in Burst Mode for polled
command processing; the BURST bit is cleared when the ACPI_EC
is in Normal mode for interrupt-driven command processing.
The BURST bit is an ACPI_EC-maintained software flag that indi-
cates the embedded controller has received the Burst Enable com-
mand from the host, has halted normal processing, and is waiting
for a series of commands to be sent from the host. Burst Mode
allows the OS or system management handler to quickly read and
write several bytes of data at a time without the overhead of SCIs
between commands.
The BURST bit is maintained by ACPI_EC software, only.
3 CMD
R
This bit is set when the OS2EC Data EC Byte 0 Register contains a
command byte written into ACPI OS COMMAND Register; this bit is
cleared when the OS2EC DATA BYTES[3:0] contains a data byte
written into the ACPI-OS DATA BYTES[3:0].
This bit is hardware controlled:
• ACPI_OS writes to any of the four ACPI-OS DATA BYTES[3:0]
bytes clears this bit
• ACPI_OS writes to the ACPI OS COMMAND Register sets this
bit.
Note:
This bit allows the embedded controller to differentiate
the start of a command sequence from a data byte write
operation.
2 UD1B
R
User Defined
Default
0b
Reset
Event
VCC1_R
ESET
0b
VCC1_R
ESET
0b
VCC1_R
ESET
 2014 - 2015 Microchip Technology Inc.
DS00001719D-page 137