UART Registers
19.5.1.8 Interrupt Identification Register (IIR) - CIR Mode
The CIR interrupt identification register (IIR) is a read-only register that provides the source of the
interrupt. The CIR interrupt identification register (IIR) is shown in
and described in
NOTE:
An interrupt source can be flagged only if enabled in the IER register.
Figure 19-41. CIR Interrupt Identification Register (IIR)
15
8
Reserved
R-0
7
6
5
4
3
2
1
0
Reserved
TXSTATUSIT
Reserved
RXOEIT
RXSTOPIT
THRIT
RHRIT
R-0
R-0
R-0
R-0
R-0
R-0
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 19-37. CIR Interrupt Identification Register (IIR) Field Descriptions
Bit
Field
Value
Description
15-6
Reserved
0
Reserved.
5
TXSTATUSIT
0
TX status interrupt inactive
1
TX status interrupt active
4
Reserved
0
Reserved.
3
RXOEIT
0
RX overrun interrupt inactive
1
RX overrun interrupt active
2
RXSTOPIT
0
Receive stop interrupt is inactive
1
Receive stop interrupt is active
1
THRIT
0
THR interrupt inactive
1
THR interrupt active
0
RHRIT
0
RHR interrupt inactive
1
RHR interrupt active
3513
SPRUH73H – October 2011 – Revised April 2013
Universal Asynchronous Receiver/Transmitter (UART)
Copyright © 2011–2013, Texas Instruments Incorporated