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Quadrature Encoder Interface (QEI)

Register 11: QEI Interrupt Status and Clear (QEIISC), offset 0x028

This register provides the current set of interrupt sources that are asserted to the controller. Bits set to 1 indicate the latched events that have occurred; a zero bit indicates that the event in question has not occurred. This is a R/W1C register; writing a 1 to a bit position clears the corresponding interrupt reason.

QEI Interrupt Status and Clear (QEIISC)

QEI0 base: 0x4002.C000

QEI1 base: 0x4002.D000

Offset 0x028

Type R/W1C, reset 0x0000.0000

 

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

 

 

 

 

 

IntError

IntDir

IntTimer

IntIndex

Type

RO

RO

RO

RO

RO

RO

RO

RO

RO

RO

RO

RO

R/W1C

R/W1C

R/W1C

R/W1C

Reset

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Bit/Field

Name

Type

Reset

Description

31:4

reserved

RO

0x00

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.

3

IntError

R/W1C

0

Phase Error Interrupt

 

 

 

 

Indicates that a phase error was detected.

2

IntDir

R/W1C

0

Direction Change Interrupt

 

 

 

 

Indicates that the direction has changed.

1

IntTimer

R/W1C

0

Velocity Timer Expired Interrupt

 

 

 

 

Indicates that the velocity timer has expired.

0

IntIndex

R/W1C

0

Index Pulse Interrupt

 

 

 

 

Indicates that the index pulse has occurred.

538

November 16, 2008

Preliminary

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