MEC1322 datasheet(139/456 Pages) MICROCHIP

139 / 456 page

 2014 - 2015 Microchip Technology Inc.

DS00001719D-page 139

MEC1322

0OBF

The Output Buffer Full bit is set to indicate that a the ACPI_EC has

written a data to the ACPI_OS and that data is ready. This bit is

automatically cleared when all the data has been read by the

ACPI_OS.

Note:

The setting and clearing of this OBF varies depending

on the setting FOUR_BYTE_ACCESS bit in the OS Byte

Control Register. Two scenarios follow:

The OBF bit is set if the Four Byte Access bit in the OS Byte

Control Register is ‘0’ when the ACPI_EC writes to the

EC2OS Data EC Byte 0 Register.

The OBF is cleared if the Four Byte Access bit in the OS Byte Con-

trol Register is cleared to ‘0’ when the ACPI_OS reads from the

ACPI OS Data Register Byte 0 Register.

The OBF is set if the Four Byte Access bit in the OS Byte Con-

trol Register is set to ‘1’ when the ACPI_EC writes to the

EC2OS Data EC Byte 3 Register.

The OBF is cleared if the Four Byte Access bit in the OS Byte Con-

trol Register is set to ‘1’ when the ACPI_OS reads from the ACPI

OS Data Register Byte 3 Register.

The ACPI Specification usage model is as follows:

The ACPI_EC must generate a software interrupt (See Note:

on page 130) to alert the ACPI_OS that the data is available.

The ACPI_OS reads the OS STATUS OS Register and sees

the OBF flag set, the ACPI_OS reads all the data available in

the ACPI-OS DATA BYTES[3:0].

The ACPI_OS reads all the data available in the ACPI-OS

DATA BYTES[3:0]. This causes the OBF bit to be automati-

cally cleared by hardware and the associated EC_OBF inter-

rupt to be asserted.

R0h

VCC1_R

ESET

Offset

04h

Bits

Description

Type

Default

Reset

Event

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