EMC2103-2-AP-TR Standard Microsystems (SMSC), EMC2103-2-AP-TR Datasheet - Page 68

• Manufacturer Part Number: EMC2103-2-AP-TR
• Description: CLOSED LOOP RPM FAN CONTROLLER
• Manufacturer: Standard Microsystems (SMSC)

Revision 0.88 (06-30-08)
6.39
6.40
6.41
ADDR
ADDR
ADDR
FCh
E6h
EFh
R/W
R-C
R/W
R/W
R/W
R
The GPIO Status Register indicates which GPIO has changed states to cause the ALERT pin to be
asserted. This register is cleared when it is read. The bits in this register are set whenever the
corresponding GPIO changes states regardless if the ALERT pins are asserted. Once a bit is set, it
will remain set until read.
If any bit in this register is set, then the GPIO status bit will be set.
Bit 1 - GPIO2_STS - Indicates that the GPIO2 pin has changed states from a ‘0’ to a ‘1’ or a ‘1’ to a
‘0’ (when configured as a GPIO input).
Bit 0 - GPIO1_STS - Indicates that the GPIO1 pin has changed states from a ‘0’ to a ‘1’ or a ‘1’ to a
‘0’ (when configured as a GPIO input).
The Software Lock Register controls the software locking of critical registers. This register is software
locked.
Bit 0 - LOCK - this bit acts on all registers that are designated SWL. When this bit is set, the locked
registers become read only and cannot be updated.
The Product Features Register indicates which pin selected functionality is enabled.
GPIO Status Register (EMC2103-2 Only)
Software Lock Register
Product Features Register
‘1’ - The ALERT pin will be asserted when the GPIO1 pin changes state (when configured as an
input)
‘0’ (default) - all SWL registers can be updated normally.
‘1’ - all SWL registers cannot be updated and a hard-reset is required to unlock them.
REGISTER
REGISTER
REGISTER
Features
Status
Product
GPIO
Software
Lock
B7
-
B7
B7
Table 6.58 Product Features Register
-
-
Table 6.56 GPIO Status Register
B6
Table 6.57 Software Lock
-
B6
B6
-
-
DATASHEET
B5
B5
B5
-
-
68
B4
B4
B4
-
-
B3
RPM-Based Fan Controller with HW Thermal Shutdown
B3
B3
-
-
B2
B2
B2
-
GPIO2_
SHDN_SEL[2:0]
STS
B1
B1
-
B1
GPIO1_
LOCK
STS
B0
B0
B0
SMSC EMC2103
DEFAULT
DEFAULT
DEFAULT
Datasheet
00h
00h
00h