Multiple Byte Write
The MMA8453Q 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
MMA8453Q 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
MMA8453Q
Sensors
Freescale Semiconductor, Inc.
17
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