XR21V1414IM-0B-EB Datasheet, PDF (27/34 Pages) Exar Corporation – 4-CH FULL-SPEED USB UART

REV. 1.3.0
XR21V1414
4-CH FULL-SPEED USB UART
GPIO_INT_MASK[5:0]: GPIOx Interrupt Mask
• Logic 0 = A change on this input causes the device to generate an interrupt packet.
• Logic 1 = A change on this input does not cause the device to generate an interrupt packet.
GPIO_INT_MASK[7:6]: Reserved
These register bits are reserved and should be ’0’.
3.3.15 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’.
3.3.16 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’.
3.3.17 GPIO_STATUS Register Description (Read-Only)
This register reports the current state of the GPIO pin.
3.4 UART Custom Registers
TABLE 15: UART CUSTOM REGISTERS
ADDRESS
REGISTER NAME
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
0X03 UART CHAN A CUSTOM
0
0
0
0
0
0
MaxPkt- WIDE_E
Size
N
0X04 UART CHAN A
LOW_LATENCY
0
0
0
0
0
0
0
EN
0X06 UART CHAN A
CUSTOM_INT_PACKET
0
GPIO5 GPIO4 GPIO3 GPIO0
0
GPIO2 GPIO1
0X0B UART CHAN B CUSTOM 0
0X0C UART CHAN B
LOW_LATENCY
0
0X0E UART CHAN B
CUSTOM_INT_PACKET
0
0
0
0
0
0
0
0
0
GPIO5 GPIO4 GPIO3 GPIO0
0
MaxPktSize WIDE_EN
0
0
EN
0
GPIO2 GPIO1
0X13 UART CHAN C CUSTOM 0
0
0
0
0
0
MaxPktSize WIDE_EN
0X14 UART CHAN C
LOW_LATENCY
0
0
0
0
0
0
0
EN
0X16 UART CHAN C
CUSTOM_INT_PACKET
0
GPIO5 GPIO4 GPIO3 GPIO0
0
GPIO2 GPIO1
0X1B UART CHAN D CUSTOM 0
0
0
0
0
0
MaxPktSize WIDE_EN
0X1C UART CHAN D
LOW_LATENCY
0
0
0
0
0
0
0
EN
0X1E UART CHAN D
CUSTOM_INT_PACKET
0
GPIO5 GPIO4 GPIO3 GPIO0
0
GPIO2 GPIO1
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