MMA6556KW【PDF 45/53 页】IC ACCELEROMETER X AXIS 16QFN

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4.2

SPI Response Format

Table 27. SPI Response Message Summary

MSB

LSB

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Response to Valid Acceleration Request

CMD

A

AX

Reference

D15

D14

AX

P

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

D1

D0

Acceleration Data

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

AX = Axis Requested

0

1

Acceleration Data Response

N/A

P = Odd Parity

S[1:0] = Device Status

0

0

1

1

0

1

0

1

In Initialization (ENDINIT = ‘0’)

Normal Data Request

ST Active

Internal Error Present / SPI Error

CMD

A

AX

D1

D0

AX

P

S1

S0

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

Reference

1

1

0

0

Accel Data

Accel Data

0

0

P

P

0

1

1

0

Acceleration Data

Self Test Active Acceleration Data

Valid Accel

1

0

Accel Data

0

P

0

0

Acceleration Data, Initialization in Process (ENDINIT=’0’)

Data Request

Section 4.3

1

1

1

1

1

1

Accel Data

Accel Data

Accel Data

1

1

1

P

P

P

0

1

0

1

0

0

Invalid Accel Request

Invalid Accel Request

Invalid Accel Request

MSB

LSB

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Response to Valid Register Access

CMD

A

AX

Reference

D15

D14

AX

P

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

D7

D6

D5

D4

D3

D2

D1

D0

Register Write

0

1

0

0

1

P

1

1

1

0

Section 4.4.1

New Contents of Register

D7

D6

D5

D4

D3

D2

D1

D0

Register Read

0

0

0

1

0

P

1

1

1

0

Section 4.4.2

Contents of Register

MSB

LSB

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Error Responses

CMD

A

AX

Reference

D15

D14

AX

P

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Invalid Accel

Request

x

x

Section 4.3

0

0

AX

P

1

1

0

0

0

0

0

0

0

0

0

0

Internal Error

Present

MISO Error

x

x

x

x

Section 4.5.5

Section 4.5.2

0

0

0

P

1

1

0

0

0

0

0

0

0

0

0

0

SPI Error

x

x

Section 4.5.1

Invalid

Register

0

x

0

0

0

0

1

1

1

0

0

0

0

0

0

0

0

0

Section 4.4

Request

Self Test Error

0

x

0

0

AX

P

1

1

0

0

0

0

0

0

0

0

0

0

Section 4.5.5

MMA655x

Sensor

Freescale Semiconductor, Inc.

45

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