MEC1404 Datasheet, PDF (221/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
13.12 EC-Only Registers
The registers listed in the EC-Only Register Summary table are for a single instance of the Mailbox. 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 Reg-
ister Base Address Table.
TABLE 13-4: EC-ONLY REGISTER BASE ADDRESS TABLE
Block Instance
Mailbox Interface
Instance Number
0
Host
EC
Address Space
32-bit address
space
Base Address
000F_2500h
The EC-Only registers can be accessed by the EC at the EC Offset from the Base Address. In addition, the registers
can be accessed through the Host Access Port, at the indexes listed in the following tables as “MBX_INDEX”.
TABLE 13-5: EC-ONLY REGISTER SUMMARY
EC Offset
00h
04h
08h
0Ch
10h
14h
18h
1Ch
Host I/O Index
(MBX_INDEX)
00h
01h
02h
03h
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
1Bh
1Ch
1Dh
1Eh
1Fh
Register Name (Mnemonic)
HOST-to-EC Mailbox Register
EC-to-Host Mailbox Register
SMI Interrupt Source Register
SMI Interrupt Mask Register
Mailbox register [0]
Mailbox register [1]
Mailbox register [2]
Mailbox register [3]
Mailbox register [4]
Mailbox register [5]
Mailbox register [6]
Mailbox register [7]
Mailbox register [8]
Mailbox register [9]
Mailbox register [A]
Mailbox register [B]
Mailbox register [C]
Mailbox register [D]
Mailbox register [E]
Mailbox register [F]
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