XR22804 Datasheet, PDF (25/47 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge with 4 UARTs

Bit
5:0
Default
Description
0x00
GPIO[N] Set
0: No effect
1: Set GPIO[N] if configured as an output to a logic ‘1’
XR22804
GPIO_CLEAR (0x04F) - Write Only
Bit
15:6
5:0
Default
Description
0x000
Reserved
These bits are reserved and should be written as ‘0’.
0x00
GPIO[N] Clear
0: No effect
1: Clear GPIO[N] if configured as an output to a logic ‘0’
GPIO_STATUS (0x050) - Read Only
Bit
15:6
5:0
Default
Description
0x000
Reserved
These bits are reserved and should be written as ‘0’.
0x00
GPIO[N] Status
Reading returns the current state of GPIO[N].
GPIO_INT_MASK (0x051) - Read/Write
Bit
15:6
5:0
Default
Description
0x000
0x00
Reserved
These bits are reserved and should be written as ‘0’.
GPIO[N] Mask
Dictates whether a change in GPIO pin state causes the device to generate a USB interrupt packet. In either
case, the GPIO status register will still report the pin's state when read, and if an interrupt packet is formed due
to other interrupt trigger, the interrupt packet will contain the current state of the pin.
0: A change in the pin's state causes the device to generate an interrupt packet.
1: A change in the pin's state does not cause the device to generate an interrupt packet.’
CUSTOMIZED_INT (0x052) - Read/Write
Bit
15:1
Default
Description
0x0000 Reserved
These bits are reserved and should be written as ‘0’.
© 2015 Exar Corporation
25 / 47
exar.com/XR22804
Rev 1B