EMC2104 datasheet(80/101 Pages) SMSC

80 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

Revision 1.74 (05-08-08)

SMSC EMC2104

DATASHEET

6.36

GPIO Direction Register

The GPIO Direction Register 1 controls the direction of GPIOs 1 through 6. When muxable pins are

not configured as a GPIO ports the respective bits are ignored.

Bit 5 - 0 - GPIOx_DIR - Controls the input / output state of GPIOs. The bit is not used if the pin is not

configured as a GPIO.

‘0’ (default) - The GPIO is configured as an input.

‘1’ - The GPIO is configured as an output.

6.37

GPIO / PWM Pin Output Configuration Register

The GPIO Output Configuration Register controls the output pin type of each GPIO pin. These settings

apply to the pin if it is configured as a GPIO output or a PWM. Bit 6 - PWM1_OT - Determines the

output type for the PWM1 pin.

‘0’ (default) - The PWM1 output is configured as an open drain output (if enabled as a PWM

output).

‘1’ - The PWM1 output is configured as a push-pull output (if enabled as an a PWM output).

Bit 2 - 0 - GPIOx_OT - Determines the output type for GPIOx.

‘0’ (default) - GPIOx is configured as an open drain output (if enabled as an output).

‘1’ - GPIOxis configured as a push-pull output (if enabled as an output).

6.38

GPIO Input Register

The GPIO Input Register indicates the state of the corresponding GPIO pin regardless of the

functionality of the pin (GPIO, PWM, or TACH) or the direction of the GPIO (input, push-pull output,

open-drain output). When a GPIO is configured as an input, any change of state will assert the

ALERT# pin (unless GPIO interrupts are masked, see Section 6.15).

Table 6.53 GPIO Direction Register

ADDR

R/W

B7B6

B5B4B3B2B1B0

DEFAULT

E1h

R/W

GPIO

Direction 1

---

GPIO

3_DIR

GPIO

2_DIR

GPIO

1_DIR

00h

Table 6.54 GPIO / PWM Pin Output Configuration Register

ADDR

R/W

DEFAULT

R/W

GPIO

Output

Config

PWM

1_OT

---

GPIO

3_OT

GPIO

2_OT

GPIO

1_OT

00h

Table 6.55 GPIO Input Register

ADDR

R/W

DEFAULT

E3h

GPIO Input

----

GPIO

3_IN

GPIO

2_IN

GPIO

1_IN

00h

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