XR22804 Datasheet, PDF (27/47 Pages) Exar Corporation – Hi-Speed USB to 10/100 Ethernet Bridge with 4 UARTs

XR22804
Table 8: Data Field of Customized Interrupt Packet - Exar Vendor Specific
Bit(s)
31-20
19
18
17
16
15-14
13
12
11
10
9
8
7-6
5
4
3
2
1
0
Description
Reserved (0)
Overrun
Parity Error
Frame Error
Break Status
Reserved (0)
RTS state
CTS state
DTR state
DSR state
CD state
RI state
Reserved (0)
RTS change
CTS change
DTR change
DSR change
CD change
RI change
Overrun, Parity Error, Frame Error, and Break all indicate that at least one event has occurred since the last interrupt mes-
sage. "State" reflects the high/low state of the pin at the time the Interrupt Data IN packet was generated. "Change" indi-
cates whether the level on the pin changed at least once since the last interrupt message.
PIN_PULLUP_EN (0x054) - Read/Write
Bit
15:8
7
6
5:0
Default
Description
0
Reserved
These bits are reserved and should be written as ‘0’.
1
UART TX
0: Disable internal pull-up resistor on the UART TX pin
1: Enable internal pull-up resistor on the UART TX pin
1
UART RX
0: Disable internal pull-up resistor on the UART RX pin
1: Enable internal pull-up resistor on the UART RX pin
0x3F
GPIO[N]
0: Disable internal pull-up resistor on the corresponding GPIO[N] pin
1: Enable internal pull-up resistor on the corresponding GPIO[N] pin
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