SC68C752BIBS NXP Semiconductors, SC68C752BIBS Datasheet - Page 28

• Manufacturer Part Number: SC68C752BIBS
• Manufacturer: NXP Semiconductors

Specifications of SC68C752BIBS

• Number Of Channels: 2
• Transmit Fifo: 64Byte
• Receive Fifo: 64Byte
• Transmitter And Receiver Fifo Counter: Yes
• Data Rate: 5Mbps
• Operating Supply Voltage (max): 5.5V
• Mounting: Surface Mount
• Pin Count: 32
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
SC68C752B_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 18.
The interrupt priority list is shown in
Table 19.
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
Description
Mirror the contents of FCR[0].
RTSn/CTSn LOW-to-HIGH change of state
1 = Xoff/Special character has been detected
3-bit encoded interrupt. See
Interrupt status.
IIR[4]
0
0
0
0
0
1
0
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
Table 18
logic 0 = an interrupt is pending
logic 1 = no interrupt is pending
Rev. 04 — 20 January 2010
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
19.
IIR[1]
1
0
0
1
0
0
0
Table
19.
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
CTSn, RTSn change of state from
active (LOW) to inactive (HIGH)
SC68C752B
© NXP B.V. 2010. All rights reserved.
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