ACE24AC02A3

Two-wire Serial EEPROM

VER 1.3

7

(C)

Random Read

Random read is a two-steps process. The first step is to initialize the internal address counter with a

target read address usin

g a “dummy write” instruction. The second step is a current address read.

To initialize the internal address counter with a target read address, the micro-controller issues a

start bit first, follows by a valid device address with the read/write bit (8

th

) set to

“0”. The EEPROM

will then acknowledge. The micro-controller will then send the address word. Again the EEPROM will

acknowledge. Instead of sending a valid written data to the EEPROM, the micro-controller performs

a current address read instruction to read the data. Note that once a start bit is issued, the EEPROM

will reset the internal programming process and continue to execute the new instruction which is to

read the current address.

Figure 5: Byte Write

Figure 6: Page Write

Figure 7: Current Address Read