SC68C752BIBS,157 NXP Semiconductors, SC68C752BIBS,157 Datasheet - Page 28

• Manufacturer Part Number: SC68C752BIBS,157
• Description: IC UART DUAL 32HVQFN
• Manufacturer: NXP Semiconductors

Specifications of SC68C752BIBS,157

• Number Of Channels: 2, DUART
• Fifo's: 64 Byte
• Voltage - Supply: 2.5V, 3.3V, 5V
• With Auto Flow Control: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935280969157; SC68C752BIBS; SC68C752BIBS

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.
28 of 48