XR16L788 Datasheet, PDF (19/42 Pages) Exar Corporation – HIGH PERFORMANCE OCTAL UART

XR16L788 OCTAL UART
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REV. 1.1.4
TABLE 8: UART CHANNEL CONFIGURATION REGISTERS DESCRIPTION. SHADED BITS ARE ENABLED BY EFR BIT-4.
ADDRESS REG READ/
A3-A0 NAME WRITE
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0 COMMENT
0 0 0 0 RHR R
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0 LCR[7]=0
0000
0000
0001
0001
0010
0010
THR
DLL
DLM
IER
ISR
FCR
W
R/W
R/W
R/W
R
W
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0 LCR[7]=0
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0 LCR[7]=1
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0 LCR[7]=1
0/
0/
0/
0 Modem RX Line TX Empty RX Data
CTS/DSR# RTS/DTR# Xon/Xoff/
Status Int. Status Int. Int.
Int.
Int. Enable Int. Enable Sp. Char.
Int. Enable
Enable Enable Enable Enable
0/
FIFOs
Enable
0/
0/
0/
INT
FIFOs Delta- Xoff/spe- Source
Enable Flow Cntl cial char Bit-3
INT
Source
Bit-2
INT
Source
Bit-1
INT
Source
Bit-0
0/
0/
0/
0/
RX FIFO RX FIFO TX FIFO TX FIFO
Trigger Trigger Trigger Trigger
DMA TX FIFO RX FIFO FIFOs
Mode Reset Reset Enable
0011
LCR
R/W Divisor Set TX Set Parity Even Parity Stop Bits Word Word
Enable Break
Parity Enable
Length Length
Bit-1 Bit-0
0100
MCR
R/W
0/
0/
0/ Internal
BRG
IR XonAny Lopback
Prescaler Enable
Enable
OP2² OP1²/ ^{RTS# Pin DTR# Pin}
RTS/DTR ^{Control Control}
Flow Sel
0101
0110
LSR
MSR
R/W
R
RX FIFO
ERROR
CD
TSR
Empty
RI
THR RX Break RX Fram- RX Parity RX Over- RX Data
Empty
ing Error Error
run Ready
DSR
CTS
Delta
CD#
Delta
RI#
Delta Delta
DSR# CTS#
MSR W
0/
0/
0/
0/ Reserved Reserved Reserved Reserved
RS485 RS485 RS485 RS485
DLY-3 DLY-2 DLY-1 DLY-0
0 1 1 1 SPR R/W Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0 User Data
1000
1001
1010
FCTR
EFR
TFCNT
R/W
R/W
R
TRG
Table
Bit-1
TRG
Table
Bit-0
Auto
RS485
Enable
Auto Auto Special
CTS/DSR RTS/DTR Char
Enable Enable Select
Bit-7 Bit-6 Bit-5
Invert IR RTS/DTR RTS/DTR RTS/DTR RTS/DTR
RX Input Hyst Bit-3 Hyst Bit-2 Hyst Bit-1 Hyst Bit-0
Enable
IER [7:4],
ISR [5:4],
FCR[5:4],
MCR[7:5]
MSR[7:4]
Software Software Software Software
Flow Cntl Flow Cntl Flow Cntl Flow Cntl
Bit-3 Bit-2 Bit-1 Bit-0
Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
1 0 1 0 TFTRG W
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
1 0 1 1 RFCNT R
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
1 0 1 1 RFTRG W
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
1 1 0 0 XCHAR R
Xon Det. Xoff Det. Self-clear
Indicator Indicator after read
1 1 0 0 XOFF1 W
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
1 1 0 1 XOFF2 W
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
1 1 1 0 XON1 W
1 1 1 1 XON2 W
Bit-7
Bit-7
Bit-6
Bit-6
Bit-5
Bit-5
Bit-4
Bit-4
Bit-3
Bit-3
Bit-2
Bit-2
Bit-1
Bit-1
Bit-0
Bit-0
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