TC9WMB1AFK/FU,TC9WMB2AFK/FU

2007-10-19

3

Functional Description

1. Start and Stop Conditions

When SCL is high, pulling SDA low produces a start condition and pulling SDA high produces a stop

condition. Every instruction is started when a start condition occurs and terminated when a stop condition

occurs.

During a read, a stop condition causes the read to terminate and the device to enter the standby state.

During a write, a stop condition causes the fetching of write data to terminate, after which writing starts

automatically. Upon the completion of writing, the device enters the standby state.

Start conditions of five times or more cannot be generated from stop condition to the next stop condition.

2. Modifying Data

Data on the SDA input can be modified while SCL is low. When SCL is high, modifying the SDA input

means a start or stop condition.

SCL

SDA

Modify data

Modify data

Figure 2

Figure 1

SCL

SDA

Start condition

Stop condition