MEC1632 datasheet(177/636 Pages) MICROCHIP

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 2012-2018 Microchip Technology Inc.

DS00001592B-page 177

MEC1632

9.10.1

ACPI OS DATA REGISTER BYTE 0

OS_DATA_B0

; ALIAS=(OS2EC_DATA_ECREG_B0)

; ALIAS=EC2OS_DATA_ECREG_B0

This register is aliased; see ACPI-OS DATA BYTES[3:0] on page 177, OS2EC DATA BYTES[3:0] on page 184, and

EC2OS DATA BYTES[3:0] on page 186 for detailed description of access rules.

ACPI-OS DATA BYTES[3:0]

Writes by the ACPI_OS to the ACPI-OS DATA BYTES[3:0] are aliased to the OS2EC DATA BYTES[3:0] registers.

Reads by the ACPI_OS from the ACPI-OS DATA BYTES[3:0] are aliased to the EC2OS DATA BYTES[3:0] registers.

All access to the ACPI-OS DATA BYTES[3:0] registers should be orderly: Least Significant Byte to Most Significant Byte

when byte access is used.

Writes to any of the four ACPI-OS DATA BYTES[3:0] registers clear the CMD bit in the STATUS OS-Register (the state

of the Four Byte Access bit in the Byte Control OS-Register has no impact.)

When the Four Byte Access bit in the Byte Control OS-Register is cleared to ‘0’, the following access rules apply:

Writes to the ACPI OS Data Register Byte 0 register set the IBF bit in the STATUS OS-Register.

Reads from the ACPI OS Data Register Byte 0 register clear the OBF bit in the STATUS OS-Register.

All writes to ACPI-OS DATA BYTES[3:1] registers complete without error but the data are not registered.

All reads from ACPI-OS DATA BYTES[3:1] registers return 00h without error.

Access to ACPI-OS DATA BYTES[3:1] has no effect on the IBF & OBF bits in the STATUS OS-Register.

When the Four Byte Access bit in the Byte Control OS-Register is set to ‘1’, the following access rules apply:

Writes to the ACPI OS Data Register Byte 3 register sets the IBF bit in the STATUS OS-Register.

Reads from the ACPI OS Data Register Byte 3 registers clears the OBF bit in the STATUS OS-Register.

9.10.2

ACPI OS DATA REGISTER BYTE 1

OS_DATA_B1

; ALIAS=OS2EC_DATA_ECREG_B1

; ALIAS=EC2OS_DATA_ECREG_B1

This register is aliased; see ACPI-OS DATA BYTES[3:0] on page 177, OS2EC DATA BYTES[3:0] on page 184, and

EC2OS DATA BYTES[3:0] on page 186 for a detailed description of access rules.

Offset

00h

Bits

Description

Type

Default

Reset

Event

7:0

ACPI-OS DATA BYTE 0

OS_DAT_B0; ALIASED

This is byte 0 of the 32-bit ACPI-OS DATA BYTES[3:0].

R/W

nSYS_R

Offset

01h

Bits

Description

Type

Default

Reset

Event

7:0

ACPI-OS DATA BYTE 1

OS_DAT_B1; ALIASED

This is byte 1 of the 32-bit ACPI-OS DATA BYTES[3:0].

R/W

nSYS_R

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