XR16C2850
A2 A1 A0
Register
[Default]
Note *5
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
Enhanced Register Set: Note *4
1
1
1
1
0
0
1
1
0
1
0
1
Xon-1[00]
Xon-2[00]
Xoff-1[00]
Xoff-2[00]
bit-7
bit-15
bit-7
bit-6
bit-14
bit-6
bit-5
bit-13
bit-5
bit-4
bit-12
bit-4
bit-3
bit-11
bit-3
bit-2
bit-10
bit-2
bit-1
bit-9
bit-1
bit-9
bit-0
bit-8
bit-0
bit-8
bit-15
bit-14
bit-13
bit-12
bit-11
bit-10
0
0
0
0
0
1
TRG [00]
Trig/
FC
Trig/
FC
Trig/
FC
Trig/
FC
Trig
FC
Trig/
FC
Trig/
FC
Trig/
FC
FCTR [00]
Rx/Tx
Mode
SCPAD
Swap
Trig
Bit-1
Trig
Bit-0
RS485
Auto
control
IrRx
Inv.
-RTS
Delay
Bit-1
-RTS
Delay
Bit-0
0
1
0
EFR [00]
Auto
-CTS
Auto
-RTS
Special
Char.
Enable
IER
Cont-3
Tx,Rx
Cont-2
Tx,Rx
Cont-1
Tx,Rx
Cont-0
Tx,Rx
select
Bits 4-7,
ISR, FCR
Bits 4-5,
MCR
Control
Control
Control
Control
Bits 5-7
1
1
1
EMSR [00]
Not
Used
Not
Used
Not
Used
Not
Used
Not
Used
Not
Used
ALT.
Rx/Tx
FIFO
Rx/-Tx
FIFO
Count
Count
Note *3: The Special Register Set is accessible only when LCR bit-7 is set to a logic 1.
Note *4: Enhanced Feature Register, Xon 1,2 and Xoff 1,2 are accessible only when LCR is set to BF
Hex.
Note *5: The value represents the registers initialized HEX value. An X signifies a 4-bit un-initialized nibble.
Rev. 1.00P
17
EXAR [ EXAR CORPORATION ]
