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KK24LC04B Datasheet(PDF) 4 Page - KODENSHI_AUK CORP. |
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KK24LC04B Datasheet(HTML) 4 Page - KODENSHI_AUK CORP. |
4 / 10 page Figure 3. Bus timing Data FUNCTIONAL DESCRIPTION The KK24LC04B/08B supports a bidirectional two wire bus and data transmission protocol. A device that sends data onto the bus is defined as transmitter, and a device receiving data as receiver. The bus has to be controlled by a master device which generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions, while the KK24LC04B/08B works as slave. Both, master and slave can operate as transmitter or receiver but the master device determines which mode is activated. BUS CHARACTERISTICS The following bus protocol has been defined: Data transfer may be initiated only when the bus is not busy. During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is HIGH will be interpreted as a START or STOP condition. Accordingly, the following bus conditions have been defined (see Figure 4). Bus not Busy (A) Both data and clock lines remain HIGH. Start Data Transfer (B) A HIGH to LOW transition of the SDA line while the clock (SCL) is HIGH determines a START condition. All commands must be preceded by a START condition. Stop Data Transfer (C) A LOW to HIGH transition of the SDA line while the clock (SCL) is HIGH determines a STOP condition. All operations must be ended with a STOP condition. Data Valid (D) The state of the data line represents valid data when, after a START condition, the data line is stable for the duration of the HIGH period of the clock signal. The data on the line must be changed during the LOW period of the clock signal. There is one clock pulse per bit of data. Each data transfer is initiated with a START condition and terminated with a STOP condition. The number of the data bytes transferred between the START and STOP conditions is determined by the master device and is theoretically unlimited, although only the last sixteen will be stored when doing a write operation. When an overwrite does occur it will replace data in a first in first out fashion. 4 KK24LC04B/08B |
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