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SC16IS750IBS Datasheet(PDF) 30 Page - NXP Semiconductors

Part # SC16IS750IBS
Description  Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

SC16IS750IBS Datasheet(HTML) 30 Page - NXP Semiconductors

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SC16IS740_750_760_6
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 13 May 2008
30 of 62
NXP Semiconductors
SC16IS740/750/760
Single UART with I2C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
8.9 Interrupt Identification Register (IIR)
The IIR is a read-only 8-bit register which provides the source of the interrupt in a
prioritized manner. Table 20 shows Interrupt Identification Register bit settings.
[1]
Modem interrupt status must be read via MSR register and GPIO interrupt status must be read via IOState
register.
[2]
Only available on SC16IS750/SC16IS760.
Table 20.
Interrupt Identification Register bits description
Bit
Symbol
Description
7:6
IIR[7:6]
mirror the contents of FCR[0]
5:1
IIR[5:1]
5-bit encoded interrupt. See Table 21.
0
IIR[0]
interrupt status
logic 0 = an interrupt is pending
logic 1 = no interrupt is pending
Table 21.
Interrupt source
Priority
level
IIR[5]
IIR[4]
IIR[3]
IIR[2]
IIR[1]
IIR[0]
Source of the interrupt
1
0
0
0
1
1
0
Receiver Line Status error
2
0
0
1
1
0
0
Receiver time-out interrupt
2
0
0
0
1
0
0
RHR interrupt
3
0
0
0
0
1
0
THR interrupt
4
0
0
0
0
0
0
modem interrupt[1][2]
5
1
1
0
0
0
0
input pin change of state[1][2]
6
0
1
0
0
0
0
received Xoff signal/
special character
7
100000
CTS, RTS change of state
from active (LOW) to inactive
(HIGH)


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