MEC1322 datasheet(140/456 Pages) MICROCHIP

140 / 456 page

MEC1322

DS00001719D-page 140

 2014 - 2015 Microchip Technology Inc.

10.12.7

OS BYTE CONTROL REGISTER

This register is aliased to the EC Byte Control Register on page 144. No behavioral differences occur due to address

aliasing.

10.13 EC-Only Registers

The registers listed in the EC-Only Register Summary table are for two instances of the

ACPI Embedded Controller

Interface (ACPI-ECI). The addresses of each register listed in this table are defined as a relative offset to the host

“Base Address” defined in the EC-Only Register Base Address Table.

The Base Address indicates where the first register can be accessed in a particular address space for a block instance.

Offset

Bits

Description

Type

Default

Reset

Event

7:1 Reserved

0 FOUR_BYTE_ACCESS

When this bit is set to ‘1’, the ACPI Embedded Controller Interface

(ACPI-ECI) accesses four bytes through the ACPI-OS DATA

BYTES[3:0].

When this bit is cleared to ‘0’, the ACPI Embedded Controller Inter-

face (ACPI-ECI) accesses one byte through the ACPI OS Data Reg-

ister Byte 0 Register. The corresponds to Legacy Mode described in

Section 10.10, "Description," on page 130.

Note 1:

This bit effects the behavior of the IBF & OBF bits in the

OS STATUS OS Register.

See ACPI-OS DATA BYTES[3:0] on page 135, OS2EC

DATA BYTES[3:0] on page 141, and EC2OS DATA

BYTES[3:0] on page 142 for detailed description of

access rules.

R0b

VCC1_R

ESET

Note:

The ACPI_OS access Base Address Register (BAR) should be configured to match the access width

selected by the Four Byte Access bit in the OS Byte Control Register. This BAR in not described in this

chapter.

TABLE 10-10: EC-ONLY REGISTER BASE ADDRESS TABLE

Block Instance

Instance

Number

Host

Address Space

Base Address

ACPI-EC

32-bit internal

address space

400F_0C00h

ACPI-EC

32-bit internal

address space

400F_1000h

TABLE 10-11: EC-ONLY REGISTER SUMMARY

Offset

100h

EC2OS Data EC Byte 0 Register

101h

EC2OS Data EC Byte 1 Register

102h

EC2OS Data EC Byte 2 Register

103h

EC2OS Data EC Byte 3 Register

104h

EC STATUS Register

105h

EC Byte Control Register

106h

Reserved

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