TC9WMB4FU Datasheet, PDF (3/17 Pages) Toshiba Semiconductor – CMOS Digital Integrated Circuits Silicon Monolithic 4096-Bit (512 × 8-Bit) 2-Wire Serial EEPROM

TC9WMB4FU
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.
t_SU.STA t_HD.STA
t_SU.STO
SCL
SDA
Start condition
Figure 1
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.
t_SU.DAT
t_HD.DAT
SCL
SDA
Modify data
Modify data
Figure 2
3
2007-10-19