MMA8652FC datasheet(19/77 Pages) FREESCALE

19 / 77 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

For the following subsections, use the following legend.

5.11.2

Multiple byte read

(See Table 11 for next auto-increment address.)

When performing a multi-byte read or “burst read”, the MMA8652FC automatically increments the received register

address commands after a read command is received.

After following the steps of a single byte read, multiple bytes of data can be read from sequential registers after each

MMA8652FC acknowledgment (AK) is received,

Until a no acknowledge (NAK) occurs from the Master,

Followed by a stop condition (SP), which signals the end of transmission.

Figure 12. Multiple Byte Read timing (I2C)

5.11.3

Single byte write

To start a write command, the Master transmits a start condition (ST) to the MMA8652FC, slave address ($1D) with the

R/W bit set to “0” for a write,

The MMA8652FC sends an acknowledgement.

Next the Master (MCU) transmits the address of the register to write to, and the MMA8652FC sends an

acknowledgement.

Then the Master (or MCU) transmits the 8-bit data to write to the designated register, and the MMA8652FC sends an

acknowledgement that it has received the data. Because this transmission is complete, the Master transmits a stop

condition (SP) to the data transfer. The data sent to the MMA8652FC is now stored in the appropriate register.

Figure 13. Single Byte Write timing (I2C)

5.11.4

Multiple byte write

(See Table 11 for next auto-increment address.)

After a write command is received, the MMA8652FC automatically increments the received register address

commands.

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

after each MMA8652FC acknowledgment (ACK) is received.

Legend

ST: Start Condition

SP: Stop Condition

NAK: No Acknowledge

W: Write = 0

SR: Repeated Start Condition

AK: Acknowledge

R: Read = 1

Master

Device Address[7:1]

SR Device Address[7:1] R

Slave

Data[7:0]

Master

NAK

Slave

Data[7:0]

Master

ST Device Address[7:1]

Data[7:0]

Slave

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