LM3S818 Luminary Micro, Inc, LM3S818 Datasheet - Page 350

• Manufacturer Part Number: LM3S818
• Description: Lm3s818 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Quadrature Encoder Interface (QEI)
350
Reset
Reset
Type
Type
Bit/Field
31:2
QEI Status (QEISTAT)
Offset 0x004
1
0
RO
RO
31
15
0
0
Register 2: QEI Status (QEISTAT), offset 0x004
This register provides status about the operation of the QEI module.
RO
RO
30
14
0
0
Direction
reserved
Name
Error
RO
RO
29
13
0
0
RO
RO
28
12
0
0
Type
RO
RO
RO
RO
RO
27
11
0
0
RO
RO
26
10
0
0
Reset
RO
RO
25
0
9
0
0
0
0
Preliminary
reserved
RO
RO
24
0
8
0
reserved
Description
Reserved bits return an indeterminate value, and should
never be changed.
Indicates the direction the encoder is rotating.
0: Forward rotation
1: Reverse rotation
Indicates that an error was detected in the gray code
sequence (that is, both signals changing at the same time).
RO
RO
23
0
7
0
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
February 6, 2007
Direction
RO
RO
17
0
1
0
Error
RO
RO
16
0
0
0