MEC1404 Datasheet, PDF (230/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
14.11 Register Aliasing between Runtime and EC-Only Registers
Table 14-2, "Runtime Register Aliasing into EC-Only Registers" indicates the aliasing from Runtime registers to EC-Only
registers. The “Host/EC Access” column distinguishes the aliasing based on access type. See individual register
descriptions for more details.
TABLE 14-2: RUNTIME REGISTER ALIASING INTO EC-ONLY REGISTERS
Host
Offset
00h
00h
01h
01h
02h
02h
03h
03h
04h
04h
05h
06h
07h
Runtime Register
Register Name (Mnemonic)
ACPI OS Data Register Byte 0
Register
ACPI OS Data Register Byte 0
Register
ACPI OS Data Register Byte 1
Register
ACPI OS Data Register Byte 1
Register
ACPI OS Data Register Byte 2
Register
ACPI OS Data Register Byte 2
Register
ACPI OS Data Register Byte 3
Register
ACPI OS Data Register Byte 3
Register
ACPI OS COMMAND Register
OS STATUS OS Register
OS Byte Control Register
Reserved
Reserved
Host
Access
W
R
W
R
W
R
W
R
W
R
R
EC
Offset
108h
Aliased EC-Only Register
Register Name (Mnemonic)
OS2EC Data EC Byte 0 Register
100h EC2OS Data EC Byte 0 Register
109h OS2EC Data EC Byte 1 Register
101h EC2OS Data EC Byte 1 Register
10Ah OS2EC Data EC Byte 2 Register
102h EC2OS Data EC Byte 2 Register
10Bh OS2EC Data EC Byte 3 Register
103h EC2OS Data EC Byte 3 Register
108h
104h
105h
106h
107h
OS2EC Data EC Byte 0 Register
EC STATUS Register
EC Byte Control Register
Reserved
Reserved
EC
Access
R
W
R
W
R
W
R
W
R
W
R/W
Table 14-3, "EC-Only Registers Summary" indicates the aliasing from EC-Only to Runtime registers. The “Host/EC
Access” column distinguishes the aliasing based on access type. See individual register descriptions for more details.
TABLE 14-3: EC-ONLY REGISTERS SUMMARY
EC
Offset
108h
EC-Only Registers
Register Name (Mnemonic)
OS2EC Data EC Byte 0 Register
108h OS2EC Data EC Byte 0 Register
EC
Access
R
R
Host
Offset
Aliased Runtime Register
Register Name (Mnemonic)
00h ACPI OS Data Register Byte 0
Register
04h ACPI OS COMMAND Register
Host
Access
W
W
DS00001956D-page 230
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