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X24C02PMG-3 Datasheet(PDF) 5 Page - IC MICROSYSTEMS |
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X24C02PMG-3 Datasheet(HTML) 5 Page - IC MICROSYSTEMS |
5 / 16 page X24C02 5 DEVICE ADDRESSING Following a start condition the master must output the address of the slave it is accessing. The most significant four bits of the slave are the device type identifier (see Figure 4). For the X24C02 this is fixed as 1010[B]. The next three significant bits address a particular device. A system could have up to eight X24C02 devices on the bus (see Figure 10). The eight addresses are defined by the state of the A0, A1 and A2 inputs. The last bit of the slave address defines the operation to be performed. When set to one a read operation is selected, when set to zero a write operations is selected. Figure 4. Slave Address Following the start condition, the X24C02 monitors the SDA bus comparing the slave address being transmitted with its slave address (device type and state of A0, A1 and A2 inputs). Upon a correct compare the X24C02 outputs an acknowledge on the SDA line. Depending on the state of the R/W bit, the X24C02 will execute a read or write operation. WRITE OPERATIONS Byte Write For a write operation, the X24C02 requires a second address field. This address field is the word address, comprised of eight bits, providing access to any one of the 256 words of memory. Upon receipt of the word address the X24C02 responds with an acknowledge, and awaits the next eight bits of data, again responding with an acknowledge. The master then terminates the transfer by generating a stop condition, at which time the X24C02 begins the internal write cycle to the nonvolatile memory. While the internal write cycle is in progress the X24C02 inputs are disabled, and the device will not respond to any requests from the master. Refer to Figure 5 for the address, acknowledge and data transfer sequence. 1 0 1 0 A2 A1 A0 R/W DEVICE TYPE IDENTIFIER DEVICE ADDRESS Figure 6. Page Write Figure 5. Byte Write BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: X24C02 S T A R T SLAVE ADDRESS S S T O P P A C K A C K A C K WORD ADDRESS DATA 3838 FHD F010 3838 FHD F011 3838 FHD F09 BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: X24C02 S T A R T SLAVE ADDRESS S S T O P P A C K A C K A C K A C K A C K WORD ADDRESS (n) DATA n DATA n+1 DATA n+3 NOTE: In this example n = xxxx 000 (B); x = 1 or 0 |
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