xr16c2852ij Exar Corporation, xr16c2852ij Datasheet - Page 23

• Manufacturer Part Number: xr16c2852ij
• Description: 2.97v To 5.5v Dual Uart With 128-byte Fifos
• Manufacturer: Exar Corporation

xr
REV. 2.1.1
See “Receiver” on page 13.
See “Transmitter” on page 11.
The Interrupt Enable Register (IER) masks the interrupts from receive data ready, transmit empty, line status
and modem status registers. These interrupts are reported in the Interrupt Status Register (ISR).
4.0 INTERNAL REGISTER DESCRIPTIONS
4.1
4.2
4.3
A
A2-A0
DDRESS
0 1 0
0 0 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
Interrupt Enable Register (IER) - Read/Write
ABLE
XOFF1 RD/WR
XOFF2 RD/WR
DREV
XON1 RD/WR
XON2 RD/WR
FCTR RD/WR
N
DVID
DLM
TRG
R
AFR
EFR
DLL
FC
AME
EG
8: INTERNAL REGISTERS DESCRIPTION.
RD/WR
RD/WR
RD/WR
RD/WR
W
R
WR
RD
RD
RD
EAD
RITE
/
Enable
RX/TX
Mode
B
Rsvd
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Auto
CTS
Bit-7
Bit-7
Bit-7
Bit-7
IT
0
-7
SCPAD
Enable
Swap
B
Rsvd
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Auto
RTS
Bit-6
Bit-6
Bit-6
Bit-6
IT
0
-6
Baud Rate Generator Divisor
Enhanced Registers
Special
Select
Table
B
Rsvd
Char
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-1
Bit-5
Bit-5
Bit-5
Bit-5
Trig
IT
0
-5
23
FCR[5:4],
IER [7:4],
ISR [5:4],
MCR[7:5]
2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS
Enable
B
Table
Rsvd
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
Bit-0
Bit-4
Bit-4
Bit-4
Bit-4
Trig
IT
1
-4
S
HADED BITS ARE ENABLED WHEN
Direction
Control
RS485
B
Rsvd
ware
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Auto
Soft-
Flow
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Cntl
IT
0
-3
RXRDY#
RX IR
B
Select
Input
ware
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Soft-
Flow
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Cntl
Inv.
IT
0
-2
Baudout#
B
Bit-1
Bit-1
Select
Bit-1
Bit-1
Bit-1
Auto
Bit-1
Soft-
ware
Flow
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
RTS
Hyst
Cntl
IT
1
-1
rent Write
Concur-
EFR B
B
ware
Flow
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Auto
RTS
Hyst
Bit-0
Soft-
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Cntl
IT
0
-0
XR16C2852
IT
LCR ≠ 0xBF
LCR ≠ 0xBF
-4=1
DLM=0x00
LCR=0
LCR[7] = 1
LCR[7] = 1
DLL=0x00
C
OMMENT
X
BF