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Inter-Integrated Circuit
Table 9-11. Master-transmitter addresses slave-receiver with a 10-bit address
Slave Address first seven bits
R/W
Slave Address Second byte
S
A1
A2
Data
A
...
Data
A/A
P
11110 + AD10 + AD9
0
AD[8:1]
After the master-transmitter has sent the first byte of the 10-bit address, the slave-receiver sees an I 2 C
interrupt. User software must ensure that for this interrupt, the contents of IICD are ignored and not treated
as valid data.
9.4.2.2
Master-receiver addresses a slave-transmitter
The transfer direction is changed after the second R/W bit. (See Table 9-12 .) Up to and including
Acknowledge Bit A2, the procedure is the same as that described for a master-transmitter addressing a
slave-receiver. After the repeated START condition (Sr), a matching slave remembers that it was addressed
before. This slave then checks whether the first seven bits of the first byte of the slave address following
the Sr are the same as they were after the START condition (S) and tests whether the eighth (R/W) bit is
1. If there is a match, the slave considers that it has been addressed as a transmitter and generates
Acknowledge A3. The slave-transmitter remains addressed until it receives a STOP condition (P) or a
repeated START condition (Sr) followed by a different slave address.
After a repeated START condition (Sr), all other slave devices also compare the first seven bits of the first
byte of the slave address with their own addresses and test the eighth (R/W) bit. However, none of them
are addressed because R/W = 1 (for 10-bit devices), or the 11110XX slave address (for seven-bit devices)
does not match.
Table 9-12. Master-Receiver Addresses a Slave-Transmitter with a 10-Bit Address
Slave
Slave Address
First seven bits
R/W
Address
Second
Slave Address
First seven bits
R/W
S
A1
byte
A2
Sr
A3
Data
A
...
Data
A
P
11110 + AD10
+ AD9
0
AD[8:1]
11110 + AD10
+ AD9
1
After the master-receiver has sent the first byte of the 10-bit address, the slave-transmitter sees an I 2 C
interrupt. User software must ensure that for this interrupt, the contents of IICD are ignored and not treated
as valid data.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
172
Freescale Semiconductor, Inc.
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