CS5378 datasheet(64/86 Pages) CIRRUS

64 / 86 page

CS5378

DS639F1

19. GENERAL PURPOSE I/O

The General Purpose I/O (GPIO) block provides 8

general purpose pins to interface with external

hardware.

19.1 Pin Descriptions

GPIO[3:0] - Pins 4 - 1

Standard GPIO pins.

GPIO[6:4]:PLL[2:0] - Pins 7 - 5

Standard GPIO pins also used to select the PLL

mode after reset. Internal pull-ups default high,

10 k

Ω external pull-downs required to set low.

GPIO7:BOOT - Pin 28

Standard GPIO pin also used to select boot mode

after reset. Internal pull-up defaults high, 10 k

Ω ex-

ternal pull-down required to set low.

19.2 GPIO Architecture

Each GPIO pin can be configured as input or out-

put, high or low, with a weak (~100 k

Ω) internal

pull-up resistor enabled or disabled.

Figure 38

shows the structure of a bi-directional GPIO pin.

19.3 GPIO Registers

GPIO pin settings are programmed in the GPCFG

GP_PULL bits enable/disable the internal pull-up

resistor, and GP_DATA bits set the output data val-

ue. After reset, GPIO pins default as inputs with

pull-up resistors enabled.

19.4 GPIO Input Mode

When reading a value from the GP_DATA bits, the

returned data reports the current state of the pins. If

a pin is externally driven high it reads a logical 1, if

externally driven low it reads a logical 0. When a

GPIO pin is used as an input, the pull-up resistor

should be disabled to save power if it isn’t required.

19.5 GPIO Output Mode

When a GPIO pin is programmed as an output with

a data value of 0, the pin is driven low and the in-

ternal pull-up resistor is automatically disabled.

When programmed as an output with a data value

of 1, the pin is driven high and the pull-up resistor

is inconsequential.

Any GPIO pin can be used as an open-drain output

by setting the data value to 0, enabling the pull-up,

and using the GP_DIR direction bits to control the

pin value. This open-drain output configuration

uses the internal pull-up resistor to hold the pin

high when GP_DIR is set as an input, and drives the

pin low when GP_DIR is set as an output.

Figure 38. GPIO Block Diagram

GPIO

GP_DIR

GP_DATA

GP_PULL

Pull Up

Logic

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