xr17c152im Exar Corporation, xr17c152im Datasheet - Page 13

• Manufacturer Part Number: xr17c152im
• Description: 5v Pci Bus Dual Uart
• Manufacturer: Exar Corporation

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REV. 1.2.0
.
F
RXRDY is cleared by reading data in the RX FIFO until it falls below the trigger level.
RXRDY Time-out is cleared by reading data until the RX FIFO is empty.
RX Line Status interrupt clears after reading the LSR register.
TXRDY interrupt clears after reading ISR register that is in the UART channel register set.
Modem Status Register interrupt clears after reading MSR register that is in the UART channel register set.
RTS/CTS or DTR/DSR delta interrupt clears after reading MSR register that is in the UART channel register set.
Xoff/Xon interrupt clears after reading the ISR register that is in the UART channel register set.
Special character detect interrupt is cleared by a read to ISR or after the next character is received.
TIMER Time-out interrupt clears after reading the TIMERCNTL register that is in the Device Configuration register set.
MPIO interrupt clears after reading the MPIOLVL register that is in the Device Configuration register set.
P
IGURE
RIORITY
N+2
Bit
1
2
3
4
5
6
7
x
Rsvd
4. T
N+1
Bit
B
HE
Bit
N
IT
[
0
0
0
0
1
1
1
1
N
G
INT3 Register
+2]
N+2
Bit
LOBAL
Rsvd
N+1
Bit
B
IT
I
T
[
NTERRUPT
Bit
0
0
1
1
0
0
1
1
N
N
ABLE
+1]
T
N+2
Bit
ABLE
5: UART C
Rsvd
N+1
B
Bit
IT
0
1
0
1
0
1
0
1
R
6: UART C
[
N
EGISTER
Bit
N
]
N+2
None
RXRDY and RX Line Status (logic OR of LSR[4:1])
RXRDY Time-out
TXRDY, THR or TSR (auto RS485 mode) empty
MSR, RTS/CTS or DTR/DSR delta or Xoff/Xon det. or special char. detected
Reserved.
MPIO pin(s). Available only in channel 0, reserved in channel 1.
TIMER Time-out. Available only in channel 0, reserved channel 1.
Bit
HANNEL
Rsvd
, INT0, INT1, INT2
INT0, INT1, INT2 and INT3
N+1
Bit
HANNEL
Interrupt Registers,
INT2 Register
Bit
N
[1:0] I
N+2
Bit
13
[1:0] I
NTERRUPT
Rsvd
N+1
Bit
NTERRUPT
Bit
N
AND
N+2
I
Bit
NTERRUPT
S
INT3
OURCE
Rsvd
Rsvd
N+1
Bit-7
Bit
C
LEARING
Rsvd Rsvd
Bit-6
Bit
N
E
S
NCODING
OURCE
Bit-5
N+2
Bit
Channel-1
:
INT0 Register
Rsvd
Bit-4
N+1
INT1 Register
Bit
(
5V PCI BUS DUAL UART
S
)
Rsvd Rsvd Ch-1 Ch-0
Bit-3
Bit
N
N+2
Bit-2
Bit
Channel-0
N+1
Bit-1
Bit
XR17C152
Bit-0
Bit
N