82801AA and 82801AB Datasheet
8-71
LPC Interface Bridge Registers (D31:F0)
8.9.4
TCO1_DAT_IN—TCO Data In Register
I/O Address:
Default Value:
Lockable:
TCOBASE +02h
0000h
No
Attribute:
Size:
Power Well:
R/W
8 bits
Core
8.9.5
TCO1_DAT_OUT—TCO Data Out Register
I/O Address:
Default Value:
Lockable:
TCOBASE +03h
0000h
No
Attribute:
Size:
Power Well:
R/W
8 bits
Core
8.9.6
TCO1_STS—TCO1 Status Register
I/O Address:
Default Value:
Lockable:
TCOBASE +04h
0000h
No
Attribute:
Size:
Power Well:
R/W
16 bits
Core
(Except bit 7, in RTC)
Unless otherwise indicated, these bits are all “sticky” and are cleared by writing a 1 to the
corresponding bit position.
Bit
Description
7:0
Data Register for passing commands from the OS to the SMI handler. Writes to this register cause
an SMI and sets the OS_TCO_SMI bit in the TCO_STS register.
Bit
Description
7:0
Data Register for passing commands from the SMI handler to the OS. Writes to this register set the
TCO_INT_STS bit in the TCO_STS register. It also causes an interrupt, as selected by the
TCO_INT_SEL bits.
Bit
Description
15:13
Reserved
12
Host Controller SERR Status (HCSERR_STS).
1 = Host Controller indicates that it wants to cause an SERR#. The software must read the Host
Controller to find out the reason for the Host Controller to generate the SERR#.
0 = Cleared by writing a 1 to its bit position.
11
Host Controller NMI Status (HCNMI_STS).
1 =
Host Controller indicates that it wants to cause an NMI. The software must read the Host
Controller to find out the reason for the Host Controller to generate the NMI.
0 = Cleared by writing a 1 to its bit position.
10
Host Controller SMI Status (HCSMI_STS).
1 = Host Controller indicates that it wants to cause an SMI. The software must read the Host
Controller to find out why it wanted the SMI.
0 = Cleared by writing a 1 to its bit position.
9
Host Controller SCI Status (HCSCI_STS).
1 =
This bit is set to 1 if the Host Controller indicates that it wants to cause an SCI. The software
must read the Host Controller to find out why it wanted the SCI.
0 = Cleared by writing a 1 to its bit position.