sc16is750 NXP Semiconductors, sc16is750 Datasheet - Page 30

• Manufacturer Part Number: sc16is750
• Description: Single Uart With I2c-bus/spi Interface, 64 Bytes Of Transmit And Receive Fifos, Irda Sir Built-in Support
• Manufacturer: NXP Semiconductors

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