KITMMA9550LEVM【PDF 169/410 页】KIT EVALUATION FOR MMA955XL

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Inter-Integrated Circuit

9.4.1.4

STOP signal

The master can terminate the communication by generating a STOP signal to free the bus. However, the

master may generate a START signal followed by a calling command without generating a STOP signal

first. This is called repeated START. A STOP signal is defined as a low-to-high transition of SDA while

SCL at logical 1 (see Figure 9-9 on page 168 ).

The master can generate a STOP even if the slave has generated an acknowledge at which point the slave

must release the bus.

9.4.1.5

Repeated START signal

As shown in Figure 9-9 on page 168 , a repeated START signal is a START signal generated without first

generating a STOP signal to terminate the communication. This is used by the master to communicate with

another slave or with the same slave in different mode (transmit/receive mode) without releasing the bus.

9.4.1.6

Arbitration procedure

The I 2 C bus is a true multi-master bus that allows more than one master to be connected on it. If two or

more masters try to control the bus at the same time, a clock synchronization procedure determines the bus

clock for which the low period is equal to the longest clock low period and the high is equal to the shortest

one among the masters. The relative priority of the contending masters is determined by a data arbitration

procedure, a bus master loses arbitration if it transmits logic 1 while another master transmits logic 0. The

losing masters immediately switch over to slave-receive mode and stop driving SDA output. In this case,

the transition from master to slave mode does not generate a STOP condition. Meanwhile, a status bit is

set by hardware to indicate loss of arbitration.

9.4.1.7

Clock synchronization

Because wire and logic is performed on the SCL line, a high-to-low transition on the SCL line affects all

the devices connected on the bus. The devices start counting their low period and after a device’s clock has

gone low, it holds the SCL line low until the clock high state is reached. However, the change of low to

high in this device clock may not change the state of the SCL line if another device clock is still within its

low period. Therefore, synchronized clock SCL is held low by the device with the longest low period.

Devices with shorter low periods enter a high wait state during this time. (See Figure 9-10 on page 171. )

When all devices concerned have counted off their low period, the synchronized clock SCL line is released

and pulled high. There is then no difference between the device clocks and the state of the SCL line and

all the devices start counting their high periods. The first device to complete its high period pulls the SCL

line low again.

MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0

170

Freescale Semiconductor, Inc.

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