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ACE24C256C Datenblatt(PDF) 11 Page - ACE Technology Co., LTD. |
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ACE24C256C Datenblatt(HTML) 11 Page - ACE Technology Co., LTD. |
11 / 20 page ACE24C256C Two-wire serial EEPROM VER 1.2 11 (B) Random Read A Random Read requires a “dummy” byte write sequence to load in the data word address. Once the device address word and data word address are clocked in and acknowledged by the ACE24C256C, the microcontroller must generate another start condition. The microcontroller now initiates a Current Address Read by sending a device address with the read/write select bit high. The ACE24C256C acknowledges the device address and serially clocks out the data word. The microcontroller does not respond with a “0” but does generate a following stop condition (see Figure 11). (C) Sequential Read Sequential Reads are initiated by either a Current Address Read or a Random Address Read. After the microcontroller receives a data word, it responds with acknowledge. As long as the ACE24C256C receives acknowledge, it will continue to increment the data word address and serially clock out sequential data words. When the memory address limit is reached, the data word address will roll-over and the Sequential Read will continue. The Sequential Read operation is terminated when the microcontroller does not respond with a “0” but does generate a following stop condition (see Figure 12) Figure10:Current Address Read Figure11:Random Read |
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