ACE24AC512 Datasheet, PDF (7/16 Pages) ACE Technology Co., LTD. – Two-wire Serial EEPROM

ACE24AC512
Two-wire Serial EEPROM
rolls over to the beginning of the memory array address. Similar to current address read, the micro-
controller can terminate the sequential read by not acknowledging the last data word received, but
sending a stop bit afterwards instead (figure 6).
(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 two address words. 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).
Figure 3: Byte Write
Figure 4: Page Write
Figure 5: Current Address Read
VER 1.1 7