MMA8452Q

Sensors

Freescale Semiconductor, Inc.

17

Multiple Byte Write

The MMA8452Q automatically increments the received register address commands after a write command is received.

Therefore, after following the steps of a single byte write, multiple bytes of data can be written to sequential registers after each

MMA8452Q acknowledgment (ACK) is received.

Command

[7:2]

Device Address

[1]

SA0

[7:1]

Device Address

R/W

[7:0]

8-bit Final Value

Read

001110

0

0x1C

1

0x39

Write

001110

0

0x1C

0

0x38

Read

001110

1

0x1D

1

0x3B

Write

001110

1

0x1D

0

0x3A

< Single Byte Read >

Master

ST

Device Address[6:0]

W

Register Address[7:0]

SR

Device Address[6:0]

R

NAK SP

Slave

AK

AK

AK

Data[7:0]

< Multiple Byte Read >

Master

ST

Device Address[6:0]

W

Register Address[7:0]

SR Device Address[6:0]

R

AK

Slave

AK

AK

AK

Data[7:0]

Master

AK

AK

NAK

SP

Slave

Data[7:0]

Data[7:0]

Data[7:0]

< Single Byte Write >

Master

ST

Device Address[6:0]

W

Register Address[7:0]

Data[7:0]

SP

Slave

AK

AK

AK

< Multiple Byte Write >

Master

ST

Device Address[6:0]

W

Register Address[7:0]

Data[7:0]

Data[7:0]

SP

Slave

AK

AK

AK

AK

Legend

ST: Start Condition

SP: Stop Condition

NAK: No Acknowledge

W: Write = 0

SR: Repeated Start Condition

AK: Acknowledge

R: Read = 1