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Slave Port Interface
8.5.8
Message format for reading the platform
Read instructions by the master involve writing the register address and reading the contents of one or
more registers. In the first part of the sequence, the bus master is placing information on the bus. In the
second, the MMA955xL platform is placing information on the bus. The I 2 C standard refers to this type
of instruction as a “combined format” because the initial write of the device and register addresses must
be followed by a read operation.
This is done by following the register address with a repeated START, a repeat of the device address (but
now with RWB = 1), an acknowledgement and a data read.
The sequence outlined above is shown in Figure 8-29 .
The MMA955xL platform is read using its internally stored register address as an address pointer, the same
way the stored register address is used as address pointer for a write. The pointer generally auto-increments
after each data byte is read using the same rules as for a write. The address will “wrap” around to Mailbox
Register 0 once Mailbox Register 31 is accessed.
The master can now read “ n ” consecutive bytes from the MMA955xL device, with the first data byte being
read from the register addressed by the initialized register address.
A7
A6
A5
A4
A3
A2
A1
A0
Eve
Device acknowledges
no stop!
S
Slave Address
0 A
Register Address
A
Repeated Start and repeat
of address are required to
change the direction of
R/W
Eve
Device acknowledges
transmission.
D7
D6
D5
D4
D3
D2
D1
D0
Eve
Device acknowledges
S
Slave Address
1 A
Data Value to send to master
A P
now
stop
R/W
master NACKS on last byte
Figure 8-29. Read of a single byte of information
The I 2 C standard specifies that a master-receiver must signal the end of transfer to a slave transmitter via
generation of a NACK (rather than ACK) prior to the Stop bit. This is shown in Figure 8-29 .
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
146
Freescale Semiconductor, Inc.
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