xr16m670 Exar Corporation, xr16m670 Datasheet - Page 25

• Manufacturer Part Number: xr16m670
• Description: 1.62v To 3.63v High Performance Uart With 32-byte Fifo
• Manufacturer: Exar Corporation

REV. 1.0.0
SEE”RECEIVER” ON PAGE 14.
SEE”TRANSMITTER” ON PAGE 13.
4.0 INTERNAL REGISTER DESCRIPTIONS
4.1
4.2
A
A2-A0
DDRESS
0 1 0
0 0 0
0 0 1
0 0 0
0 0 1
0 0 0
0 0 1
0 1 0
1 0 0
1 0 1
1 1 0
1 1 1
T
Receive Holding Register (RHR) - Read- Only
Transmit Holding Register (THR) - Write-Only
ABLE
XOFF1 RD/WR
XOFF2 RD/WR
DREV
FCTR RD/WR
XON1 RD/WR
XON2 RD/WR
N
DVID
DLM
DLD
EFR
R
DLL
FC
AME
EG
7: INTERNAL REGISTERS DESCRIPTION.
RD/WR
RD/WR
RD/WR
RD/WR
R
W
RD
RD
RD
EAD
RITE
/
Enable
RX/TX
select
select
CTS#
B
BRG
Bit-7
Bit-7
Bit-7
Bit-7
Auto
Bit-7
Bit-7
Bit-7
Bit-7
IT
0
-7
Indepen-
Enable
Enable
RTS#
Swap
B
BRG
SCR
Bit-6
Bit-6
Bit-6
Bit-6
Auto
Bit-6
Bit-6
Bit-6
Bit-6
dent
IT
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO
0
-6
Baud Rate Generator Divisor
4X Mode 8X Mode
Enhanced Registers
Special
Select
B
Char
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
IT
0
0
-5
25
MCR[7:5],
FCR[5:3],
IER [7:4],
ISR [5:4],
Enable
B
Bit-4
Bit-4
Bit-4
Bit-4
DLD
Bit-4
Bit-4
Bit-4
Bit-4
IT
0
0
-4
S
HADED BITS ARE ENABLED WHEN
interrupt
RS485
mode
B
Soft-
ware
Flow
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Cntl
IT
0
-3
RX IR
invert
B
ware
Flow
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Soft-
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Cntl
IT
1
-2
B
ware
Flow
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Soft-
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Cntl
IT
0
0
-1
EFR B
B
ware
Flow
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Soft-
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Cntl
IT
1
0
XR16M670
-0
IT
-4=1
DLM= 0x00
LCR[7] = 1
LCR≠0xBF
DLL= 0x00
LCR[7] = 1
LCR≠0xBF
LCR[7] = 1
LCR≠0xBF
EFR[4] = 1
LCR=0
C
DLD[7:6]
OMMENT
X
BF