XR21V1412 Ver la hoja de datos (PDF) - Exar Corporation

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XR21V1412

2-CH FULL-SPEED USB UART

Exar Corporation 

XR21V1412

REV. 1.0.0

2-CH FULL-SPEED USB UART

GPIO_MODE[3]: Transceiver Enable Polarity

• Logic 0 = Low for TX

• Logic 1 = High for TX

GPIO_MODE[7:4]: Reserved

These register bits are reserved. When writing to these bits, the value should be ’0’. When reading from these

bits, they are undefined and should be ignored.

3.3.12 GPIO_DIRECTION Register Description (Read/Write)

This register controls the direction of the GPIO if it is not controlled by the GPIO_MODE register.

GPIO_DIRECTION[5:0]: GPIOx Direction

• Logic 0 = GPIOx is an input.

• Logic 1 = GPIOx is an output.

GPIO_DIRECTION[7:6]: Reserved

These register bits are reserved and should be ’0’.

3.3.13 GPIO_SET Register Description (Read/Write)

Writing a ’1’ in this register drives the GPIO output high. Writing a ’0’ to a bit has no effect. Bits 7-6 are unused

and should be ’0’.

3.3.14 GPIO_CLEAR Register Description (Read/Write)

Writing a ’1’ in this register drives the GPIO output low. Writing a ’0’ to a bit has no effect. Bits 7-6 are unused

and should be ’0’.

3.3.15 GPIO_STATUS Register Description (Read-Only)

This register reports the current state of the GPIO pin.

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