LM3S3749 Luminary Micro, Inc, LM3S3749 Datasheet - Page 664

• Manufacturer Part Number: LM3S3749
• Description: Lm3s3749 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Reset
Reset
Type
Type
Quadrature Encoder Interface (QEI)
QEI Status (QEISTAT)
QEI0 base: 0x4002.C000
Offset 0x004
Type RO, reset 0x0000.0000
664
Bit/Field
31:2
RO
RO
1
0
31
15
0
0
RO
RO
Register 2: QEI Status (QEISTAT), offset 0x004
This register provides status about the operation of the QEI module.
30
14
0
0
RO
RO
29
13
reserved
Direction
0
0
Name
Error
RO
RO
28
12
0
0
RO
RO
27
11
0
0
Type
RO
RO
RO
RO
RO
26
10
0
0
RO
RO
Reset
25
0x00
0
9
0
reserved
0
0
Preliminary
RO
RO
24
0
8
0
reserved
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.
Direction of Rotation
Indicates the direction the encoder is rotating.
The Direction values are defined as follows:
Error Detected
Indicates that an error was detected in the gray code sequence (that is,
both signals changing at the same time).
Value
0
1
RO
RO
23
0
7
0
Description
Forward rotation
Reverse rotation
RO
RO
22
0
6
0
RO
RO
21
0
5
0
RO
RO
20
0
4
0
RO
RO
19
0
3
0
RO
RO
18
0
2
0
Direction
RO
RO
17
0
1
0
June 02, 2008
Error
RO
RO
16
0
0
0