Uart interrupt identification register – Digi NS9215 User Manual
Page 408
S E R I A L C O N T R O L M O D U L E : U A R T
UART Interrupt Identification register
408
Hardware Reference NS9215
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
U A R T I n t e r r u p t I d e n t i f i c a t i o n r e g i s t e r
Address: 9001_1108 / 9001_9108 / 9002_1108 / 9002_9108, Read
The UART Interrupt Identification register reads the source of the interrupt from
the UART. This register is for diagnostic purposes only.
Register
Register bit
assignment
D02
R/W
ELSI
0
Enables receive line status interrupt
0
Disabled
1
Enabled
D01
R/W
ETBEI
0
Enables transmit holding register empty interrupt
0
Disabled
1
Enabled
D00
R/W
ERBFI
0
Enables receive data available interrupt
0
Disabled
1
Enabled
Bits
Access
Mnemonic
Reset
Description
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
30
Reserved
Reserved
IIR
Bits
Access
Mnemonic
Reset
Description
D31:04
N/A
Reserved
N/A
N/A
D03:00
R
IIR
N/A
Interrupt identification
0110
Receiver line status error
0100
Receive data available
0010
Transmit holding register empty
0000
Modem status