ACE24LA02.04.08.16A

Two-wire Serial EEPROM

VER 1.1

8

Random Read:

A random read requires a "dummy" byte write sequence to load in the data word address. Once the

device address word and data word address are clocked in and acknowledged by the EEPROM, the

microcontroller must generate another start condition. The microcontroller now initiates a current address

read by sending a device address with the read/write select bit high. The EEPROM acknowledges the

device address and serially clocks out the data word. The microcontroller does not respond with a "0" but

does generate a following stop condition (see Figure 8)

Sequential Read:

Sequential reads are initiated by either a current address read or a random address read. After the

microcontroller receives a data word, it responds with an acknowledge. As long as the EEPROM receives

an acknowledge, it will continue to increment the data word address and serially clock out sequential data

words. When the memory address limit is reached, the data word address will "roll over" and the

sequential read will continue. The sequential read operation is terminated when the microcontroller does

not respond with a "0" but does generate a following stop condition (see Figure9).

MSB

LSB

2K

1

0

1

0

0

0

0

R/W

4K

1

0

1

0

0

0

P0

R/W

8K

1

0

1

0

0

P1

P0

R/W

16K

1

0

1

0

P2

P1

P0

R/W

Figure 4: Device Address

Figure 5: Byte write