MEC1632 datasheet(182/636 Pages) MICROCHIP

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MEC1632

DS00001592B-page 182

 2012-2018 Microchip Technology Inc.

OBF

(OBF_OS; ALIASED)

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

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

automatically cleared when all data have 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 Byte Control OS-

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

trol OS-Register is ‘0’ when the ACPI_EC writes to the EC2OS

Data EC-Register Byte 0.

The OBF is cleared if the Four Byte Access bit in the Byte Control

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

ACPI OS Data Register Byte 0.

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

OS-Register is set to ‘1’ when the ACPI_EC writes to the

EC2OS Data EC-Register Byte 3.

The OBF is cleared if the Four Byte Access bit in the Byte Control

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

OS Data Register Byte 3.

The ACPI Specification usage model is as follows:

The ACPI_EC must generate a software interrupt (See Note:

on page 171) to alert the ACPI_OS that the data is available.

The ACPI_OS reads the 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

nSYS_R

Offset

04h

Bits

Description

Type

Default

Reset

Event

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