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Slave Port Interface
The MMA955xL device monitors the bus continuously, waiting for a START condition followed by its
slave address. When it recognizes its slave address, it acknowledges that communication and is ready for
continued communication.
8.5.7
Message format for writing
The figures in this section make use of the following notation:
S Start Bit/Repeated Start Bit
A Acknowledge Bit
A
Not-Acknowledge Bit
P Stop Bit
A write to the MMA955xL platform comprises the transmission of the device's slave address with the
read/write bit set to 0, followed by at least one byte of information. The first byte of information is the
register address of the first internal register (0x00 to 0x21) that is to be updated.
If a STOP condition is detected after just the register address is received, the MMA955xL device takes no
action. This is shown in Figure 8-26.
A7
A6
A5
A4
A3
A2
A1
A0
Eve
Device acknowledges
S
Slave Address
0 A
Register Address
A P
R /W
Eve
Device acknowledges
Figure 8-26. Minimal I 2 C command has no effect
The MMA955xL device clears its internal register address pointer to register 0x00 when a STOP condition
is detected, so a single-byte write has no net effect because the register address given in this first-and-only
byte is replaced by 0x00 at the STOP condition.
The internal register address pointer is not , however, cleared on a repeated START condition. Figure 8-27
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
144
Freescale Semiconductor, Inc.
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