xr21b1411 Exar Corporation, xr21b1411 Datasheet - Page 18

• Manufacturer Part Number: xr21b1411
• Description: Enhanced 1-ch Full-speed Usb Uart
• Manufacturer: Exar Corporation

XR21B1411
ENHANCED 1-CH FULL-SPEED USB UART
This register reports the current state of each of the GPIO pins.
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.
GPIO_INT_MASK[5:0]: GPI0[5:0]
GPIO_INT_MASK[11:6]: Reserved
Enables the customized interrupt packet format to report all GPIO status in the interrupt packet.
CUSTOMIZED_INT[0]: Enable
CUSTOMIZED_INT[11:1]: Reserved
3.1.1.17
3.1.1.18
3.1.1.19
Logic 0 = A change in the pin's state causes the device to generate an interrupt packet.
Logic 1 = A change in the pin's state does not cause the device to generate an interrupt packet.
These bits are reserved and should remain ’0’.
Logic 0 = Use standard interrupt packet.
Logic 1 = Use customized interrupt packet.
These bits are reserved and should remain ’0’.
O
FFSET
0
1
2
4
6
8
GPIO_STATUS Register Description (Read Only)
GPIO_INT_MASK Register Description (Read / Write)
CUSTOMIZED_INT Register Description (Read / Write)
bmRequestType
bNotification
wLength
wValue
wIndex
F
Data
IELD
(B
S
YTES
IZE
1
1
2
2
2
2
T
)
ABLE
(See
8’b10100001
Table 10
int_status
16’h0000
16’h0000
16’h0002
Standard
8: I
See Table 9
V
Table 9
8’h20
See Table 10
ALUE
NTERRUPT
)
or
18
D6:5 = Class Type
D4-0: = Interface Recipient
D7-0 = Interface number, 8’h00 for the CDC Com-
mand Interface
D7 = Device-to-host direction
Defined encoding for SERIAL_STATE
D15-8 = Reserved (0)
2 bytes of transferred data
D15-7 = Reserved (0)
D6 = bOverRun
D5 = bParity
D4 = bFraming
D3 = bRingSignal (RI)
D2 = bBreak
D1 = bTxCarrier (DSR)
D0 = bRxCarrier (CD)
P
ACKET
F
ORMAT
D
ESCRIPTION
REV. 1.1.0