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XR21B1420 Datasheet, PDF (35/60 Pages) Exar Corporation – Enhanced 1-Ch Full-Speed USB UART | |||
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Bit
9:8
7
6
5:4
3
2
1
0
Default
Description
0
Reserved
These bits are reserved and should be written as â0â.
0
RXT
0: When USE_SUSPEND is â1â, clear this bit to a â0â
1: When USE_SUSPEND is â1â, set this bit to a â1â
0
TXT
0: When USE_SUSPEND is â1â, clear this bit to a â0â
1: When USE_SUSPEND is â1â, set this bit to a â1â
0
Reserved
These bits are reserved and should be written as â0â.
0
RS485
0: When USE_SUSPEND is â1â, clear this bit to a â0â
1: When USE_SUSPEND is â1â, set this bit to a â1â
0
CTS
0: When USE_SUSPEND is â1â, clear this bit to a â0â
1: When USE_SUSPEND is â1â, set this bit to a â1â
0
RTS
0: When USE_SUSPEND is â1â, clear this bit to a â0â
1: When USE_SUSPEND is â1â, set this bit to a â1â
0
CLK
0: When USE_SUSPEND is â1â, clear this bit to a â0â
1: When USE_SUSPEND is â1â, set this bit to a â1â
XR21B1420
SUSPEND_MODE (0x06B) - Read/Write
Bit
15
14
13
12
11
10
Default
Description
0
USE_SUSPEND
0: GPIO pins will retain output state when device is suspendedâ
1: GPIO pins will assert state defined in SUSPEND_STATE and mode defined in SUSPEND_MODE when device is sus-
pended.
0
Reserved
This bit is reserved and should be written as â0.â
0
DSR
0: When USE_SUSPEND is â1â, output will be actively driven
1: When USE_SUSPEND is â1â, output will be open drain
0
DTR
0: When USE_SUSPEND is â1â, output will be actively driven
1: When USE_SUSPEND is â1â, output will be open drain
0
RI
0: When USE_SUSPEND is â1â, output will be actively driven
1: When USE_SUSPEND is â1â, output will be open drain
0
CD
0: When USE_SUSPEND is â1â, output will be actively driven
1: When USE_SUSPEND is â1â, output will be open drain
© 2014 Exar Corporation
35 / 60
exar.com/XR21B1420
Rev 1A
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