ACE34AC04

4K I

VER 1.1

12

(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 using 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 (8th) 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 7: Byte Write

Figure 8: Page Write

Figure 9: Current Address Read