LAN8818DSLASHKDX datasheet(62/101 Pages) MICROCHIP

62 / 101 page

LAN8818D

DS00005832C-page 62

5.18.2

GPIO INTERRUPTS

Each GPIO provides the ability to trigger a unique GPIO interrupt in the GPIO Interrupt Status Registers. Reading the

GPIO Interrupt Status Registers provides the current status of all GPIO interrupts. Each interrupt is enabled by setting

the corresponding bit in the GPIO Interrupt Enable Registers. The GPIO Controller aggregates the enabled interrupt

values into an internal signal that is sent to the main interrupt logic and is reflected via the GPIO Interrupt bit in the Chip-

level Interrupt Status register.

GPIO16

SOF2

PHYAD4

—

GPIO15

SOF0

PHYAD3

GPIO14

PORT3LED2

PHYAD2/

PORT3_LED2_POL

To enable LED operation with either a

pull-up or pull-down, LED Polarity

takes on the inverted value of the

configuration strap. Refer to Section

5.19, "LEDs" and Section 3.3.4, "LED

Polarity (PORT[3:0]_LED[2:1]_POL)"

for additional information.

GPIO13

PORT3LED1

PHYAD1/

PORT3_LED1_POL

GPIO12

PORT0LED2

PHYAD0/

PORT0_LED2_POL

GPIO11

PORT0LED1

LED_MODE/

PORT0_LED1_POL

GPIO10

RCVRD_CLK_OUT2

——

GPIO9

RCVRD_CLK_OUT1

GPIO8

RCVRD_CLK_IN2

GPIO7

RCVRD_CLK_IN1

GPIO6

1588_STI_DO

MODE_SEL4

GPIO5

1588_STI_CLK

MODE_SEL3

GPIO4

1588_STI_CS_N

MODE_SEL2

GPIO3

1588_LD_ADJ

MODE_SEL1

GPIO2

1588_REF_CLK

—

GPIO1

1588_EVENT_B

MODE_SEL0

Note:

The following must be considered when using GPIOs:

• Configuring a pin as a GPIO input automatically enables an internal pull-up.

• Internal pull-up resistors prevent unconnected inputs from floating. Do not rely on internal resistors to

drive signals external to the device. When connected to a load that must be pulled high, an external

resistor must be added.

• Configuring a pin as a GPIO output automatically disables the internal pull-up. Open-drain outputs

may require an external pull-up depending on the application.

TABLE 5-8:

GPIO ALTERNATE FUNCTIONS (CONTINUED)

GPIO

Alternate Function

Configuration Strap

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