XR21B1424_17 Datasheet, PDF (23/64 Pages) Exar Corporation – Enhanced 4-Ch Full-Speed USB UART

Address
Register Name
0x013
0x014
0x015
0x016
PIN_OPEN_DRAIN[15:8]
PIN_OPEN_DRAIN[7:0]
PIN_PULLUP_EN[15:8]
PIN_PULLUP_EN[7:0]
PIN_PULLDOWN_EN[15:8]
PIN_PULLDOWN_EN[7:0]
LOOPBACK
0x017
0x018
0x01F
0x040
0x041
0x042
0x043
0x044
0x045
0x046
0x047
0x060
0x06A
IR_MODE
OUTCLK[15:8]
OUTCLK[7:0]
REMOTE_WAKE
TX_FIFO_FLUSH
TX_FIFO_COUNT[15:8]
TX_FIFO_COUNT[7:0]
TX_WIDE_MODE
RX_FIFO_FLUSH
RX_FIFO_COUNT[15:8]
RX_FIFO_COUNT[7:0]
RX_WIDE_MODE
LOW_LATENCY
RX_THRESHOLD[15:8]
RX_THRESHOLD[7:0]
CUSTOM_DRIVER
SUSPEND_STATE[15:8]
SUSPEND_STATE[7:0]
0x06B
0x260
SUSPEND_MODE[15:8]
SUSPEND_MODE[7:0]
REVISION_ID^a
XR21B1424
Table 5: XR21B1424 Register Map
Bit 7
(15)
0
GPIO7
0
GPIO7
0
GPIO7
0
0
0
0
0
0
0
0
0
0
0
0
0
RXT
USE_-
SUS-
PEND
RXT
Bit 6
(14)
0
GPIO6
0
GPIO6
0
GPIO6
0
0
0
0
0
0
0
0
0
0
0
0
0
TXT
0
TXT
Bit 5
(13)
0
GPIO5
0
GPIO5
0
GPIO5
0
0
0
0
0
0
0
0
0
0
0
0
DSR
0
DSR
0
Bit 4
(12)
0
GPIO4
0
GPIO4
0
GPIO4
0
Bit 3
(11)
TX
GPIO3
0
GPIO3
0
GPIO3
0
0
0
DIV_HI
DIV_LO
0
RX_EN
0
0
0
0
COUNT[7:0]
0
0
0
0
0
0
COUNT[7:0]
0
0
0
0
0
0
COUNT[7:0]
0
0
DTR
RI
0
RS485
Bit 2
(10)
0
GPIO2
RX
GPIO2
RX
GPIO2
DTR_
DSR
TX_-
PULSE
RI_EN
AUTO_-
CLOSE
0
0
AUTO_-
CLOSE
0
0
0
0
0
CD
CTS
Bit 1
(9)
GPIO9
GPIO1
GPIO9
GPIO1
GPIO9
GPIO1
RTS_
CTS
RX_I
NVERT
Bit 0
(8)
GPIO8
GPIO0
GPIO8
GPIO0
GPIO8
GPIO0
TX_
RX
EN
0
0
AUTO_
OPEN
RESET
COUNT[9:8]
0
EN
AUTO_
OPEN
RESET
COUNT[9:8]
0
EN
0
EN
COUNT[9:8]
0
ACTIVE
0
0
RTS
CLK
DTR
RI
CD
0
0
0
RS485
CTS
RTS
CLK
VALUE
23 / 64
exar.com/XR21B1424
Rev 1C