LE24C322M Datasheet, PDF (7/12 Pages) Sanyo Semicon Device – Two Wire Serial Interface EEPROM (32k EEPROM)

LE24C322M
6 EEPROM write operation
6-1. Byte writing
When the EEPROM receives the 7-bit device address and write command code "0" after the start condition, it
generates an acknowledge signal. After this, if it receives 4-bit don’t-care bits and a 12-bit word address, generates an
acknowledge signal, receives the 8-bit writing data, and generates an acknowledge signal when it receives the stop
condition, the rewrite operation of the EEPROM in the designated memory address will start. Rewriting is completed
in the tWC period after the stop condition. During an EEPROM rewrite operation, no input is accepted and no
acknowledge signals are generated.
Word Address
Data
SDA
1 0 1 0 S2 S1 S0 W
*
*
*
*
A A _{A9 A8}
11 10
A7 A6 A5 A4 A3 A2 A1 A0
D7 D6 D5 D4 D3 D2 D1 D0
ACK
ACK
ACK
ACK
R/W
6-2. Page writing
*: don’t care
This product enables pages with up to 16 bytes to be written. The basic data transfer procedure is the same as for byte
writing: Following the start condition, the 7-bit device address and write command code “0,” word address (n), and
data (n) are input in this order while confirming acknowledge “0” every 9 bits. The page write mode is established if,
after data (n) is input, the write data (n+1) is input without inputting the stop condition. After this, the write data
equivalent to the largest page size can be received by a continuous process of repeating the receiving of the 8-bit
write data and generating the acknowledge signals.
At the point when the write data (n+1) has been input, the lower 4 bits (A0-A3) of the word addresses are
automatically incremented to form the (n+1) address. In this way, the write data can be successively input, and the
word address on the page is incremented each time the write data is input. If the write data exceeds 16 bytes or the
last address of the page is exceeded, the word address on the page is rolled over. Write data will be input into the
same address two or more times, but in such cases the write data that was input last will take effect. Finally, the
EEPROM internal write operation corresponding to the page size for which the write data is received starts from the
designated memory address when the stop condition is received.
Word Address(n)
Data(n)
SDA
1 0 1 0 S2 S1 S0 W
*
*
*
*
A A _{A9 A8}
11 10
ACK
R/W
Data(n+1)
A7 A6 A5 A4 A3 A2 A1 A0
ACK
D7 D6 D5 D4 D3 D2 D1 D0
ACK
Data(n+x)
ACK
D7 D6 _- D1 D0
•••••
ACK
ACK
D7 D6 _- D1 D0
ACK
D7 D6 _- D1 D0 D7 D6 _- D1 D0
ACK
ACK
*: don’t care
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