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LE24L0221 Datasheet(PDF) 7 Page - Sanyo Semicon Device |
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LE24L0221 Datasheet(HTML) 7 Page - Sanyo Semicon Device |
7 / 11 page LE24L0221 No.A1557-7/11 6 EEPROM write operation 6-1. Byte writing When the EEPROM receives the 7-bit device address and write command code “0” after the start condition, it generates an acknowledge signal. After this, if it receives the 8-bit word address, generates an acknowledge signal, receives the 8-bit write data, generates an acknowledge signal and then receives the stop condition, the internal write operation of the EEPROM in the designated memory address will start. Rewriting is completed in the tWC period after the stop condition. During an EEPROM internal write operation, no input is accepted and no acknowledge signals are generated. 6-2. Page writing This product enables pages with up to 16 bytes to be written. The basic data transfer procedure is the same as for byte writing: Following the start condition, the 7-bit device address and write command code “0,” word address (n), and data (n) are input in this order while confirming acknowledge “0” every 9 bits. The page write mode is established if, after data (n) is input, the write data (n+1) is input without inputting the stop condition. After this, the write data equivalent to the largest page size can be received by a continuous process of repeating the receiving of the 8-bit write data and generating the acknowledge signals. At the point when the write data (n+1) has been input, the lower 4 bits (A0-A3) of the word addresses are automatically incremented to form the (n+1) address. In this way, the write data can be successively input, and the word address on the page is incremented each time the write data is input. If the write data exceeds 16 bytes or the last address of the page is exceeded, the word address on the page is rolled over. Write data will be input into the same address two or more times, but in such cases the write data that was input last will take effect. Finally, the EEPROM internal write operation corresponding to the page size for which the write data is received starts from the designated memory address when the stop condition is received. 6-3. Acknowledge polling Acknowledge polling is used to find out when the EEPROM internal write operation is completed. When the stop condition is received and the EEPROM starts rewriting, all operations are prohibited, and no response can be given to the signals sent by the master device. Therefore, in order to find out when the EEPROM internal write operation is completed, the start condition, device address and write command code are sent from the master device to the EEPROM (slave device), and the response of the slave device is detected. In other words, if the slave device does not send the acknowledge signal, it means that the internal write operation is in progress; conversely, if it does send the acknowledge signal, it means that the internal write operation has been completed. Word Address 0 1 0 S1 1 W ACK ACK ACK SDA A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 Data R/W S2 S0 SDA Memory Address(n) 0 1 0 1 W ACK ACK A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 Data(n) ACK D7 D6 - D1 D0 ACK • • • • • Data(n+1) R/W S1 S2 S0 ACK D7 D6 - D1 D0 D7 D6 - D1 D0 D7 D6 - D1 D0 D7 D6 - D1 D0 ACK ACK • • • • • Data(n+x) 0 1 0 1 W NO ACK SDA • • • • • 0 10 1 NO ACK 0 1 0 1 ACK R/W S1 S2 S0 S1 S2 S0 S1 S2 S0 WW R/W R/W During Write End of Write During Write |
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