emc2105 Standard Microsystems Corp., emc2105 Datasheet - Page 72

• Manufacturer Part Number: emc2105
• Description: Emc2105 Rpm-based High Side Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
E6h
ADDR
EFh
ADDR
FCh
Revision 1.74 (05-08-08)
6.37
6.38
6.39
R/W
R-C
R/W
R/W
R/W
R
REGISTER
REGISTER
Status
The GPIO Status Register indicates which GPIO has changed states to cause the ALERT pins 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 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.
Bit 1 - 0 - SHDN_SEL[1:0] - Indicates what the detected pin state of the SHDN_SEL pin was and which
functions are enabled.
GPIO Status Register
GPIO
Software Lock Register
Product Features Register
Software
Lock
‘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
Features
Product
B7
-
B7
-
B7
-
Table 6.55 Product Features Register
Table 6.54 Software Lock Register
B6
Table 6.53 GPIO Status Register
-
B6
-
B6
-
DATASHEET
B5
-
RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
B5
B5
-
-
72
B4
B4
-
-
B4
-
B3
-
B3
-
B3
-
B2
-
B2
-
B2
-
SHDN_SEL[1:0]
B1
B1
B1
-
-
B0
SMSC EMC2105
LOCK
GPIO1_
B0
STS
Datasheet
B0
DEFAULT
00h
DEFAULT
DEFAULT
00h
00h