Datenblatt-Suchmaschine für elektronische Bauteile |
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ACE24AC04.08.16 Datenblatt(PDF) 6 Page - ACE Technology Co., LTD. |
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ACE24AC04.08.16 Datenblatt(HTML) 6 Page - ACE Technology Co., LTD. |
6 / 18 page ACE24AC04.08.16 Two-wire Serial EEPROM VER 1.2 6 bit. After receiving the stop bit, the EEPROM will go into a self-timed programming mode during which all external inputs will be disabled. After a programming time of TWC, the byte programming will finish and the EEPROM device will return to the standby mode. B. Page Write A page write is similar to a byte write with the exception that one to sixteen bytes can be programmed along the same page or memory row. All ACE24AC04.08.16 are organized to have 16 bytes per memory row or page. With the same write command as the byte write, the micro-controller does not issue a stop bit after sending the 1 st byte data and receiving the acknowledge signal from the EEPROM on the 27th clock cycle. Instead it sends out a second 8-bit data word, with the EEPROM acknowledging at the 36 th cycle. This data sending and EEPROM acknowledging cycle repeats until the micro-controller sends a stop bit after the n × 9 th clock cycle. After which the EEPROM device will go into a self- timed partial or full page programming mode. After the page programming completes after a time of TWC, the devices will return to the standby mode. The least significant 4 bits of the word address (column address) increments internally by one after receiving each data word. The rest of the word address bits (row address) do not change internally, but pointing to a specific memory row or page to be programmed. The first page write data word can be of any column address. Up to 16 data words can be loaded into a page. If more then 16 data words are loaded, the 17 th data word will be loaded to the 1 st data word column address. The 18 th data word will be loaded to the 2 nd data word column address and so on. In other word, data word address (column address) will “roll” over the previously loaded data. C. Acknowledge Polling Acknowledge polling may be used to poll the programming status during a self-timed internal programming. By issuing a valid read or write address command, the EEPROM will not acknowledge at the 9 th clock cycle if the device is still in the self-timed programming mode. However, if the programming completes and the chip has returned to the standby mode, the device will return a valid acknowledge signal at the 9 th clock cycle. Read Operations The read command is similar to the write command except the 8th read/write bit in address word is set to “1”. The three read operation modes are described as follows: (A) Current Address Read The EEPROM internal address word counter maintains the last read or write address plus one if the power supply to the device has not been cut off. To initiate a current address read operation, the micro-controller issues a start bit and a valid device address word with the read/write bit (8th) set to “1”. The EEPROM will response with an acknowledge signal on the 9th serial clock cycle. An 8-bit data word will then be serially clocked out. The internal address word counter will then |
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