XR21B1424_17 Datasheet, PDF (32/64 Pages) Exar Corporation – Enhanced 4-Ch Full-Speed USB UART

XR21B1424
Table 8: Customized Interrupt Packet Format
Offset
Field
0
GPIO_STATE
2
GPIO_INT
4
Data
Size
(Bytes)
2
2
1
Value
Description
Byte 0: GPIO_STATE[7:0]
Byte 1: GPIO_STATE[9:8]
Byte 2: GPIO_INT[7:0]
Byte 3: GPIO_INT[9:8]
D15:4 = Reserved (0)
D3 = Overrun Error
D2 = Parity Error
D1 = Frame Error
D0 = Break Status
PIN_OPEN_DRAIN (0x013) - Read/Write
This register controls all pins configured as outputs irrespective of if they are configured as GPIO or alternate functions.
Bit
15:12
11
10
9:8
7
6:0
Default
Description
0
Reserved
These bits are reserved and should be written as ‘0’.
0
UART TX
0: TX Pin is push-pull output
1: TX Pin pin is open drain output
0
Reserved
These bits are reserved and should be written as ‘0’.
0
Pin Open Drain on GPIO[9:8]
0: Pin configured as output is push-pull output
1: Pin configured as output is open drain output
1
Pin Open Drain on GPIO7/RS485
0: Pin configured as output is push-pull output
1: Pin configured as output is open drain output
0
Pin Open Drain on GPIO[6:0]
0: Pin configured as output is push-pull output
1: Pin configured as output is open drain output
32 / 64
exar.com/XR21B1424
Rev 1C