complete, the Master transmits a stop condition (SP) to the data transfer. The data sent to the MMA8451Q is now stored in the
appropriate register.
Multiple Byte Write
The MMA8451Q 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
MMA8451Q acknowledgment (ACK) is received.
Table 11. I 2 C Device Address Sequence
Command
Read
Write
Read
Write
[6:1]
Device Address
001110
001110
001110
001110
[0]
SA0
0
0
1
1
[6:0]
Device Address
0x1C
0x1C
0x1D
0x1D
R/W
1
0
1
0
8-bit Final Value
0x39
0x38
0x3B
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
Slave
Data[7:0]
AK
Data[7:0]
AK
Data[7:0]
NAK
SP
< 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
SR: Repeated Start Condition
SP: Stop Condition
AK: Acknowledge
NAK: No Acknowledge
R: Read = 1
W: Write = 0
Figure 11. I 2 C Timing Diagram
MMA8451Q
Sensors
18
Freescale Semiconductor, Inc.
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