EMC2103 Standard Microsystems Corporation, EMC2103 Datasheet - Page 66

• Manufacturer Part Number: EMC2103
• Description: Rpm-based Fan Controller with HW Thermal Shutdown
• Manufacturer: Standard Microsystems Corporation

Revision 0.85 (01-29-08)
6.35
6.36
6.37
ADDR
ADDR
ADDR
E3h
E2
E4h
R/W
R/W
R/W
R
R/W
R/W
The GPIO Output Configuration Register controls the output pin type of each GPIO pin.
Bit 1 - GPIO2_OT - Determines the output type for GPIO2.
Bit 0 - GPIO1_OT - Determines the output type for GPIO1.
The GPIO Input Register indicates the state of the corresponding GPIO pin. When a GPIO is
configured as an input, any change of state will assert the ALERT# pin (unless GPIO interrupts are
masked, see
Bit 1 - GPIO2_IN - Indicates the pin state of the GPIO2 pin regardless of the pin functionality.
Bit 0 - GPIO1_IN - Indicates the pin state of the GPIO1 pin regardless of the pin functionality.
The GPIO Output Register controls the state of the corresponding pins when they are configured as
outputs.
If the output is configured as an open-drain output, then it requires a pull-up resistor to VDD. Setting
the corresponding bit to a ‘1’ will act to disable the output allowing the pull-up resistor to pull the output
high. Setting the corresponding bit to a ‘0’ will enable the output and drive the pin to a logical ‘0’ state.
GPIO Output Configuration Register (EMC2103-2 Only)
GPIO Input Register (EMC2103-2 Only)
GPIO Output Register (EMC2103-2 Only)
‘0’ (default) - GPIO2 is configured as an open drain output (if enabled as an output).
‘1’ - GPIO2 is configured as a push-pull output (if enabled as an output).
‘0’ (default) - GPIO1 is configured as an open drain output (if enabled as an output).
‘1’ - GPIO1 is configured as a push-pull output (if enabled as an output).
REGISTER
REGISTER
GPIO Input
Output
Config
REGISTER
GPIO
Output 1
GPIO
Section
Table 6.51 GPIO Output Configuration Register
6.15).
B7
B7
-
-
B7
-
Table 6.53 GPIO Output Register
Table 6.52 GPIO Input Register
B6
B6
-
B6
-
DATASHEET
B5
B5
B5
66
B4
B4
B4
RPM-Based Fan Controller with HW Thermal Shutdown
B3
B3
B3
B2
B2
B2
GPIO2
_OUT
GPIO
GPIO
2_OT
2_IN
B1
B1
B1
GPIO1
_OUT
GPIO
GPIO
1_OT
1_IN
B0
B0
B0
SMSC EMC2103
DEFAULT
DEFAULT
DEFAULT
Datasheet
00h
00h
00h