MEC1322 Datasheet, PDF (142/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
10.13.3 OS2EC DATA EC BYTE 2 REGISTER
This register is aliased; 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.
Offset ^10Ah
Bits
Description
Type
Default
Reset
Event
7:0 OS2EC_DATA_BYTE_2
This is byte 2 of the 32-bit OS2EC DATA BYTES[3:0].
R/W
0h
VCC1_R
ESET
10.13.4 OS2EC DATA EC BYTE 3 REGISTER
This register is aliased; 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.
Offset ^10Bh
Bits
Description
7:0 OS2EC_DATA_BYTE_3
This is byte 3 of the 32-bit OS2EC DATA BYTES[3:0].
Type
R/W
Default
0h
Reset
Event
VCC1_R
ESET
10.13.5 EC2OS DATA EC BYTE 0 REGISTER
This register is aliased; 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.
Offset ^100h
Bits
Description
Type
Default
Reset
Event
7:0 EC2OS_DATA_BYTE_0
This is byte 0 of the 32-bit EC2OS DATA BYTES[3:0].
EC2OS DATA BYTES[3:0]
R/W
0h
VCC1_R
ESET
Writes by the ACPI_EC to the EC2OS DATA BYTES[3:0] are aliased to the ACPI-OS DATA BYTES[3:0]
All access to the EC2OS DATA BYTES[3:0] registers should be orderly: Least Significant Byte to Most Significant Byte
when byte access is used.
When the FOUR_BYTE_ACCESS bit in the OS Byte Control Register is cleared to ‘0’, the following access rules apply:
1. Writes to the EC2OS Data EC Byte 0 Register set the OBF bit in the OS STATUS OS Register.
2. Reads from the EC2OS DATA BYTES[3:0] have no effect on the IBF bit in the OS STATUS OS Register.
3. All reads from EC2OS DATA BYTES[3:1] return 00h without error.
4. All writes to EC2OS DATA BYTES[3:1] complete without error but the data are not registered.
5. Access to EC2OS DATA BYTES[3:1] have no effect on the IBF & OBF bits in the OS STATUS OS Register.
When the FOUR_BYTE_ACCESS bit in the OS Byte Control Register is set to ‘1’, the following access rules apply:
1. Writes to the EC2OS Data EC Byte 3 Register set the OBF bit in the OS STATUS OS Register.
2. Reads from the EC2OS DATA BYTES[3:0] have no effect on the IBF bit in the OS STATUS OS Register.
DS00001719D-page 142
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