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Slave Port Interface
8.5.5
Acknowledge
The acknowledge bit is the clocked ninth bit ( Figure 8-24 ) that the recipient uses to handshake receipt of
each byte of data. Thus each byte transferred effectively requires nine bits. The master generates the ninth
clock pulse and the recipient pulls down SDA during the acknowledge clock pulse. That makes the SDA
line stable low during the high period of the clock pulse. When the master is transmitting to the
MMA955xL platform, the device generates the acknowledge bit because it is the recipient.
When the MMA955xL device is transmitting to the master, the master generates the acknowledge bit
because the master is the recipient.
Start condition
Clock pulse
for acknowledgement
SCL
1
2
3
4
5
6
7
8
9
SDA
(By transmitter)
SDA
(By receiver )
Figure 8-24. Acknowledge
8.5.6
Slave address
The MMA955xL platform has a seven-bit long slave address ( Figure 8-25 ). The bit following the seven-bit
slave address (Bit 8) is the read/write bit, which is low for a write command and high for a read command.
The device address for the MMA955xL platform is software-programmable via the SP_ADDR register.
This value must be programmed prior to start of any I 2 C communications unless the default value (0x4C)
is used.
.
SDA
1
0
0
1
1
0
0
R/W
ACK
MSB
LSB
SCL
.
Figure 8-25. Slave address
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
143
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