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XR88C681 Datasheet, PDF (88/99 Pages) Exar Corporation – CMOS DUAL CHANNEL UART (DUART) | |||
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XR88C681
Bit 7
Bit 6
Channel Mode
J 7
J
2'
J 9' 9
J 9
Bit 5
Tx RTS
Control
J 7
J G%
Bit 4
CTS Enable
Tx
J 7
J G%
Bit 3
Bit 2
Bit 1
Stop Bit Length
Bit 0
J 6/1
J /6
J /==
1 J >6
< J =1
6 J =>6
/ J 1=
> J
= J 6/1
J /6
J /==
* J >6
J =1
J =>6
2 J 1=
J
Table 30. Mode Register 2: MR2A, MR2B
Bit 7
Bit 6
Bit 5
Receiver Clock Select
Table 9
Bit 4
Bit 3
Bit 2
Bit 1
Transmitter Clock Select
Table 9
Table 31. Clock Select Registers: CSRA, CSRB
Bit 0
Bit 7
Bit 6
Bit 5
Miscellaneous Commands
! (
Section B.2
Bit 4
Bit 3
Bit 2
Enable/Disable Tx
J 7
-
J 2
!
J (% !
J 7
$
7 %
Table 32. Command Registers: CRA, CRB
Bit 1
Bit 0
Enable/Disable Rx
J 7
-
J 2
!
J (% !
J 7
$
7 %
Bit 7
Received
Break
J 7
J G%
Bit 6
Framing
Error
J 7
J G%
Bit 5
Parity Error
J 7
J G%
Bit 4
Overrun
Error
J 7
J G%
Bit 3
TXEMT
J 7
J G%
Bit 2
TXRDY
J 7
J G%
Table 33. Status Registers: SRA, SRB
Bit 1
FFULL
J 7
J G%
Bit 0
RXRDY
J 7
J G%
Bit 7
OP7
J,N>O
J5G*
Bit 6
OP6
J,N/O
J5G
Bit 5
OP5
J,N6O
J5G.
99*
Bit 4
OP4
J,N<O
J5G.
99
Bit 3
Bit 2
OP3
J ,N1O
J . S
J 5* 5
J 5* 5
Bit 1
Bit 0
OP2
J ,NO
J 5
/5
J 5
5
J 5
5
Table 34. Output Port Configuration Register: OPCR
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