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Slave Port Interface
.
acknowledge
A7
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
acknowledge
S
Slave Address
0 A
Register Address
A
Data Byte
A P
1 byte
R/W
acknowledge
auto-increment register address
clear register address
Figure 8-27. Writing one byte of information into slave I 2 C
Any bytes received after the register address are data bytes. The first data byte goes into the internal
register of the MMA955xL platform that was designated by the register address. If multiple data bytes are
transmitted before a STOP condition is detected, these bytes are generally stored in subsequent
MMA955xL device internal registers because the register address increments after each access. This
auto-increment feature works identically for read and write operations.
The address will “wrap” around to Mailbox Register 0 once the Mailbox Register 31 is accessed.
Figure 8-28 illustrates the case where three bytes of information are written into three consecutive, slave
I 2 C registers.
acknowledge auto-increments register address
A7
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
acknowledge
S
Slave Address
0 A
Register Address
A
Data Byte for Address + 0
A
R/W
acknowledge
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
Data Byte for Address + 1
A
Data Byte for Address + 2
A P
clear register address
Figure 8-28. Three consecutive byte writes to the slave I 2 C data registers
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
145
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