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Inter-Integrated Circuit
9.3.2.3
I 2 C Control register
7
6
5
4
3
2
1
0
Read
IICEN
IICIE
MST
TX
TXAK
RSTA
WUEN
0
Write
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 9-4. I 2 C Control register (IICC1)
Table 9-6. IICC1 I 2 C Control register (IICC1) descriptions
Bit(s)
7
6
5
4
3
Field
IICEN
IICIE
MST
TX
TXAK
Description
I2C Enable
The IICEN bit determines whether the I 2 C module is enabled.
0 I 2 C is not enabled.
1 I 2 C is enabled.
I2C Interrupt Enable
The IICIE bit determines whether an I 2 C interrupt is requested.
0 I 2 C interrupt request not enabled.
1 I 2 C interrupt request enabled.
Master Mode Select
When the MST bit is changed from 0 to 1, a START signal is generated on the bus and master mode is
selected. When this bit changes from 1 to 0 a STOP signal is generated and the mode of operation
changes from master to slave.
0 Slave mode.
1 Master mode.
Transmit Mode Select
The TX bit selects the direction of master and slave transfers.
In master mode this bit must be set according to the type of transfer required. Therefore, for address
cycles, this bit is always high. When addressed as a slave this bit must be set by software according to
the SRW bit in the status register.
0 Receive.
1 Transmit.
Transmit Acknowledge Enable
This bit specifies the value driven onto the SDA during data acknowledge cycles for both master and
slave receivers.
There are two conditions that effect NACK/ACK generation.
Note: SCL is held to low until TXAK is written.
? If FACK (fast NACK/ACK) is cleared:
0 An acknowledge signal is sent to the bus on the following receiving data byte.
1 No acknowledge signal response is sent to the bus on the following receiving data byte.
? If FACK bit is set. no ACK or NACK is sent after receiving one data byte until this TXAK bit is written:
0 An acknowledge signal is sent out to the bus on the current receiving data byte
1 No acknowledge signal response is sent to the bus on the current receiving data byte
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
161
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