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TC9WMB1FK Arkusz danych(PDF) 7 Page - Toshiba Semiconductor |
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TC9WMB1FK Arkusz danych(HTML) 7 Page - Toshiba Semiconductor |
7 / 15 page TC9WMB1FK,TC9WMB2FK 2002-07-31 7 (2) Random read A random read reads data at a specified address. A dummy write is necessary to specify an address. In random read mode, enter a device address, R/W (= 0), and a word address after a start condition. Unlike a byte or page write, where write data is entered immediately, a dummy write only specifies a word address. Then, supply a start condition and enter a device address and R/W (= 1) in the same way as for a current address read, to read data from the specified address. (3) Sequential read A sequential read reads data sequentially from successive word addresses. For either current address read or random read, after entering a start condition, a device address, and R/W (= 1), inputting a low acknowledge signal causes the word address to be incremented automatically to read data at the next address. After the last address is reached, the word address is rolled over to address 0. Figure 9 SDA LINE 1 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 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 DEVICE ADDRESS R E A D A C K R / W D 7 A C K S T O P DATA (n) READ DATA (n) DATA (n + 1) READ DATA (n + 1) A C K DATA (n + 2) READ DATA (n + 2) A C K D 7 D 6 DATA (n + m) READ DATA (n + m) N O A C K Address increment Address increment Address increment Address increment Figure 8 SDA LINE 1 0 1 0 × × × 0 W 6 W 4 W 5 W 3 W 1 W 2 W 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 D 7 D 6 D 4 D 5 D 3 D 1 D 2 D 0 DATA (n) S T O P *: Don't care for the TC9WMB1 L S B M S B 1 010 ×××1 S T A R T M S B DEVICE ADDRESS R E A D L S B READ DATA (n) N O A C K Address increment DUMMY WRITE |
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