XR16C854 Datasheet, PDF (24/51 Pages) Exar Corporation – QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO

XR16C854
A2 A1 A0
Register
[Default]
Note *5
BIT-7
BIT-6
Enhanced Register Set Note*3
000
TRG [00]
Trig/
FC
Trig/
FC
0 0 1 FCTR [00]
Rx/Tx
Mode
SCPAD
Swap
010
EFR [00]
Auto
-CTS
Auto
-RTS
1 1 1 EMSR [00]
Not
Used
Not
Used
100
101
110
111
Xon-1[00]
Xon-2[00]
Xoff-1[00]
Xoff-2[00]
bit-7
bit-15
bit-7
bit-15
bit-6
bit-14
bit-6
bit-14
FIFO Ready Register: Note *4
XXX
FIFORdy
RXRDY
D
RXRDY
C
BIT-5
BIT-4
BIT-3
Trig/
Trig/
Trig
FC
FC
FC
Trig
Bit-1
Trig
Bit-0
RS-485
Auto
control
Special
Char.
select
Enable
IER
Bits 4-7,
ISR, FCR
Bits 4-5,
MCR
Bits 5-7
Cont-3
Tx,Rx
Control
Not
Used
Not
Used
Not
Used
bit-5
bit-13
bit-5
bit-13
bit-4
bit-12
bit-4
bit-12
bit-3
bit-11
bit-3
bit-11
RXRDY
B
RXRDY
A
TXRDY
D
BIT-2
Trig/
FC
IrRx
Inv.
Cont-2
Tx,Rx
Control
Not
Used
bit-2
bit-10
bit-2
bit-10
TXRDY
C
BIT-1
Trig/
FC
-RTS
Delay
Bit-1
Cont-1
Tx,Rx
Control
ALT.
Rx/Tx
FIFO
Count
bit-1
bit-9
bit-1
bit-9
TXRDY
B
BIT-0
Trig/
FC
-RTS
Delay
Bit-0
Cont-0
Tx,Rx
Control
Rx/-Tx
FIFO
Count
bit-0
bit-8
bit-0
bit-8
TXRDY
A
Note *²: The Special register set is accessible only when LCR bit-7 is set to “1”.
Note *³: Enhanced Feature Register, Xon 1,2 and Xoff 1,2 are accessible only when LCR is set to “BF” HEX.
Note *⁴: FIFORdy register is available only in 100 pin QFP packages and is selected by -CSRDY vice A0-A2.
Note *⁵: The value between the square brackets represents the register’s initialized HEX value.
Rev. 1.00P
24