LM3S1G21 Datasheet, PDF (525/955 Pages) Texas Instruments – Stellaris® LM3S1G21 Microcontroller

Stellaris^® LM3S1G21 Microcontroller
Register 30: EPI Raw Interrupt Status (EPIRIS), offset 0x214
This register is the raw interrupt status register. On a read, it gives the current state of each interrupt
source. A write has no effect.
Note that raw status for read and write is set or cleared based on FIFO fullness as controlled by
EPIFIFOLVL.
Raw status for error is held until the error is cleared by writing to the EPIEISC register.
EPI Raw Interrupt Status (EPIRIS)
Base 0x400D.0000
Offset 0x214
Type RO, reset 0x0000.0004
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
WRRIS RDRIS ERRRIS
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Bit/Field
31:3
2
1
Name
reserved
WRRIS
RDRIS
Type
RO
RO
RO
Reset
0x000
1
0
Description
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
Write Raw Interrupt Status
Value Description
0 The number of available entries in the WFIFO is above the range
specified by the WRFIFO field in the EPIFIFOLVL register.
1 The number of available entries in the WFIFO is within the
trigger range specified by the WRFIFO field in the EPIFIFOLVL
register.
This bit is cleared when the level in the WFIFO is above the trigger point
programmed by the WRFIFO field.
Read Raw Interrupt Status
Value Description
0 The number of valid entries in the NBRFIFO is below the trigger
range specified by the RDFIFO field in the EPIFIFOLVL register.
1 The number of valid entries in the NBRFIFO is in the trigger
range specified by the RDFIFO field in the EPIFIFOLVL register.
This bit is cleared when the level in the NBRFIFO is below the trigger
point programmed by the RDFIFO field.
January 22, 2012
525
Texas Instruments-Production Data