xr21v1414 Exar Corporation, xr21v1414 Datasheet - Page 23

• Manufacturer Part Number: xr21v1414
• Description: 4-ch Full-speed Usb Uart
• Manufacturer: Exar Corporation

REV. 1.0.0
GPIO_MODE[3]: Transceiver Enable Polarity
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•
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.
This register controls the direction of the GPIO if it is not controlled by the GPIO_MODE register.
GPIO_DIRECTION[5:0]: GPIOx Direction
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•
GPIO_DIRECTION[7:6]: Reserved
These register bits are reserved and should be ’0’.
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’.
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’.
This register reports the current state of the GPIO pin.
3.3.12
3.3.13
3.3.14
3.3.15
Logic 0 = Low for TX
Logic 1 = High for TX
Logic 0 = GPIOx is an input.
Logic 1 = GPIOx is an output.
GPIO_DIRECTION Register Description (Read/Write)
GPIO_SET Register Description (Read/Write)
GPIO_CLEAR Register Description (Read/Write)
GPIO_STATUS Register Description (Read-Only)
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4-CH FULL-SPEED USB UART
XR21V1414