SC16C754BIA68 NXP Semiconductors, SC16C754BIA68 Datasheet - Page 30

• Manufacturer Part Number: SC16C754BIA68
• Description: IC, UART, QUAD, 64BYTE FIFO, 16C754
• Manufacturer: NXP Semiconductors

Specifications of SC16C754BIA68

• No. Of Channels: 4
• Data Rate: 5Mbps
• Supply Voltage Range: 2.25V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: PLCC
• No. Of Pins: 68
• Svhc: No SVHC (18-Jun-2010)
• Uart Features: DMA Signalling Capability, Software Selectable Baud Rate Generator
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
SC16C754B_4
Product data sheet
7.9 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 17.
The interrupt priority list is shown in
Table 18.
Bit
7:6
5
4
3:1
0
Priority
level
1
2
2
3
4
5
6
Symbol
IIR[7:6]
IIR[5]
IIR[4]
IIR[3:1]
IIR[0]
IIR[5]
0
0
0
0
0
0
1
Interrupt identification register bits description
Interrupt priority list
IIR[4]
0
0
0
0
0
1
0
Description
Mirror the contents of FCR[0].
RTS/CTS LOW-to-HIGH change of state.
1 = Xoff/special character has been detected.
3-bit encoded interrupt. See
Interrupt status.
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 64-byte FIFOs
Table 17
logic 0 = an interrupt is pending
logic 1 = no interrupt is pending
Rev. 04 — 6 October 2008
IIR[3]
0
1
0
0
0
0
0
shows interrupt identification register bit settings.
IIR[2]
1
1
1
0
0
0
0
Table
18.
IIR[1]
1
0
0
1
0
0
0
Table
18.
IIR[0]
0
0
0
0
0
0
0
Source of the interrupt
Receiver line status error
Receiver time-out interrupt
RHR interrupt
THR interrupt
Modem interrupt
Received Xoff signal/
special character
CTS, RTS change of state from
active (LOW) to inactive (HIGH)
SC16C754B
© NXP B.V. 2008. All rights reserved.
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