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TC9WMB1FK Arkusz danych(PDF) 5 Page - Toshiba Semiconductor |
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TC9WMB1FK Arkusz danych(HTML) 5 Page - Toshiba Semiconductor |
5 / 15 page TC9WMB1FK,TC9WMB2FK 2002-07-31 5 5. Write Operation (1) Byte write A byte write writes data to a specified address. After a start condition, input a device address, W R/ (= 0), a word address, and write data. When a stop condition is entered subsequently, write operation starts automatically, rewriting the data at the specified address with the input data. A next instruction cannot be accepted while write operation is in progress. Therefore, no acknowledge signal is returned. After writing the data, the chip automatically enters the standby state. (2) Page write A page write writes up to eight bytes of data collectively to a specified page. After a start condition, input a device address, W R/ (= 0), a word address (n), and write data (n), in the same way as for a byte write. Then, input write data (n + 1) immediately without entering a stop condition, while checking that an acknowledge signal is asserted (0). The upper four bits (A3 to A6) of the word address are fixed and the lower three bits (A0 to A2) are automatically incremented so that up to eight bytes of data can be input. When the last address within the page is reached, the lower three bits (A0 to A2) of the word address are rolled over to the first address of the page. If more than eight bytes of write data are input, the last eight bytes are valid. When a stop condition is entered subsequently, write operation starts automatically, rewriting the data at the specified addresses with the input data. Figure 5 SDA LINE 1 0 1 0 × × × 0 W 6 W 4 W 5 W 3 W 1 W 2 W 0 D 7 D 6 D 4 D 5 D 3 D 1 D 2 D 0 S T A R T M S B DEVICE ADDRESS W R I T E L S B A C K R / W W 7 * WORD ADDRESS A C K A C K WRITE DATA S T O P Address increment *: Don't care for the TC9WMB1 M S B L S B Figure 6 SDA LINE 1 0 1 0 × × × 0 W 6 W 4 W 5 W 3 W 1 W 2 W 0 D 7 D 6 D 4 D 5 D 3 D 1 D 2 D 0 D 7 D 6 D 4 D 5 D 3 D 1 D 2 D 0 D 4 D 5 D 3 D 1 D 2 D 0 S T A R T M S B DEVICE ADDRESS W R I T E L S B A C K R / W W 7 * WORD ADDRESS (n) A C K A C K WRITE DATA (n) WRITE DATA (n + 1) A C K WRITE DATA (n + m) S T O P A C K Address increment Address increment Address increment *: Don't care for the TC9WMB1 |
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