CDB5376 Cirrus Logic Inc, CDB5376 Datasheet - Page 69

• Manufacturer Part Number: CDB5376
• Description: EVALUATION BOARD FOR CS5376
• Manufacturer: Cirrus Logic Inc

Specifications of CDB5376

• Main Purpose: Seismic Evaluation System
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: CS3301A, CS3302A, CS4373A, CS5372A, CS5376A
• Primary Attributes: Quad Digital Filter
• Secondary Attributes: Graphical User Interface, SPI™ & USB Interfaces
• Processor To Be Evaluated: CS330x, CS4373A, CS537x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1778

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.
19.5.1 GPIO Reads in Output Mode
When reading GPIO pins the GP_DATA register
value always reports the current state of the pins, so
DS612F4
a value written in output mode does not necessarily
read back the same value. If a pin in output mode is
written as a logical 1, the CS5376A attempts to
drive the pin high. If an external device forces the
pin low, the read value reflects the pin state and re-
turns a logical 0. Similarly, if an output pin is writ-
ten as a logical 0 but forced high externally, the
read value reflects the pin state and returns a logical
1. In both cases the CS5376A is in contention with
the external device resulting in increased power
consumption.
CS5376A
69