XR20V2172IL64 EXAR [Exar Corporation], XR20V2172IL64 Datasheet - Page 23

• Manufacturer Part Number: XR20V2172IL64
• Description: TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER
• Manufacturer: EXAR [Exar Corporation]

0x0A
0x0B
0x0C IOIntEna RD/WR
0x0D reserved
0x0E IOControl RD/WR
A
0x0F
0x02
0x06
REV. P1.0.1
SEE”RECEIVER” ON PAGE 15.
SEE”TRANSMITTER” ON PAGE 13.
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).
0x00
0x01
0x02
0x04
0x05
0x07
4.0 INTERNAL REGISTER DESCRIPTIONS
4.1
4.2
4.3
DDR
IOState
XOFF1
XOFF2
EFCR
XON1
XON2
T
N
IODir
Receive Holding Register (RHR) - Read- Only
Transmit Holding Register (THR) - Write-Only
Interrupt Enable Register (IER) - Read/Write
DLM
DLD
EFR
R
DLL
ABLE
AME
EG
8: INTERNAL REGISTERS DESCRIPTION.
RD/WR
RD/WR
RD/WR
RD/WR
RD/WR
RD/WR
RD/WR
RD/WR
RD/WR
RD/WR
RD/WR
W
R
EAD
RITE
-
/
Enable
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER
B
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Bit-7
Auto
CTS
Bit-7
Bit-7
Bit-7
Bit-7
IT
0
0
0
-7
Auto RTS
Enable
B
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
Bit-6
IT
0
0
0
-6
Baud Rate Generator Divisor
Special
Select
Mode
B
Char
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Bit-5
Enhanced Registers
4X
IT
PRELIMINARY
0
0
0
-5
MCR[7:5],
FCR[5:4],
IER [7:4],
ISR [5:4],
8X Mode
Enable
23
B
Bit-4
Bit-4
Bit-4
Bit-4
Bit-4
DLD
Bit-4
Bit-4
Bit-4
Bit-4
IT
0
0
0
-4
S
HADED BITS ARE ENABLED WHEN
Divisor
UART
Reset
tional
B
Frac-
ware
Flow
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Soft-
Bit-3
Bit-3
Bit-3
Bit-3
Bit-3
Cntl
SW
IT
0
0
-3
GPIO or
IO Ch B
Modem
Disable
Divisor
B
Frac-
tional
ware
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Soft-
Flow
Bit-2
Bit-2
Bit-2
Bit-2
Bit-2
Cntl
TX
IT
0
-2
GPIO or
IO Ch A
Modem
Disable
Divisor
Frac-
tional
B
Soft-
ware
Flow
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Bit-1
Cntl
RX
IT
0
-1
IOLatch
Divisor
B
Frac-
tional
EFR B
ware
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Soft-
Flow
Bit-0
Bit-0
Bit-0
Bit-0
Bit-0
Cntl
IT
0
0
XR20V2172
-0
IT
-4=1
LCR=0
LCR ≠ 0xBF
LCR ≠ 0xBF
C
LCR[7]=1
LCR[7]=1
EFR[4]=1
OMMENT
X
BF