XR21B1420 Datasheet, PDF (39/60 Pages) Exar Corporation – Enhanced 1-Ch Full-Speed USB UART

Address
Register Name
0x020
0x024
PIN_CFG_USB_STAT2
PIN_CFG_CLK
0x025
PIN_CFG_RTS
0x026
PIN_CFG_CTS
0x027
PIN_CFG_RS485
0x028
PIN_CFG_TXT
0x029
PIN_CFG_RXT
0x02A
PIN_CFG_CD
0x02B
PIN_CFG_RI
0x02C
PIN_CFG_DTR
0x02D
PIN_CFG_DSR
0x02E
PIN_CFG_DATA_PINS
0x02F
0x030
0x031
0x032
0x033
0x034
SUSPEND_STATE (MSB)
SUSPEND_STATE (LSB)
SUSPEND_MODE (MSB)
SUSPEND_MODE (LSB)
PIN_CFG_RS485_POL
CLK_DIV
XR21B1420
Table 9: XR21B1420 OTP Memory
Bit 7
0
PULL
UP
PULL
UP
PULL
UP
PULL
UP
PULL
UP
PULL
UP
PULL
UP
PULL
UP
PULL
UP
PULL
UP
PULL
UP
0
RXT
0
RXT
Bit 6
0
PULL_
DOWN
PULL_
DOWN
PULL_
DOWN
PULL_
DOWN
PULL_
DOWN
PULL_
DOWN
PULL_
DOWN
PULL_
DOWN
PULL_
DOWN
PULL_
DOWN
PULL_
DOWN
0
TXT
0
TXT
Bit 5
0
0
0
0
0
0
0
0
0
0
RX_
REM_
WAKE
DSR
0
DSR
0
Bit 4
SEL
0
0
0
0
0
0
0
0
0
0
0
DTR
0
DTR
0
VALUE
Bit 3
0
0
0
0
0
0
0
0
0
0
0
RI
RS485
RI
RS485
Bit 2
CTRL
0
0
0
0
0
0
CTRL
0
0
CD
CTS
CD
CTS
Bit 1
CTRL
CTRL
CTRL
CTRL
CTRL
CTRL
CTRL
CTRL
CTRL
0
0
RTS
0
RTS
Bit 0
CTRL
0
CLK
0
CLK
POL
© 2014 Exar Corporation
39 / 60
exar.com/XR21B1420
Rev 1A