MB85RC256VN

DS501-00092-1v0-E

7



COMMAND

• Byte Write

If the device address word (R/W “0” input) is sent following the start condition, the slave responds with an

ACK. After this ACK, write addresses and data are sent in the same way, and the write ends by generating

a stop condition at the end.

Note : In the MB85RC256VN, input “0” to the most significant bit of the higher address byte because the address

is expressed with 15 bits.

• Page Write

If additional 8 bits are continuously sent after the same command (except stop condition) as Byte Write, a

page write is performed. The memory address rolls over to first memory address (0000H) at the end of the

address. Therefore, if more than 32 Kbytes are sent, the data is overwritten in order starting from the start

of the memory address that was written first. Because FeRAM performs the high-speed write operations,

the data will be written to FeRAM right after the ACK response finished.

Note: It is not necessary to take a period for internal write operation cycles from the buffer to the memory after

the stop condition is generated.

LSB

Start Condition

Stop Condition

ACK (SDA is the "L" level)

A

S

P

MSB

0 X X XXXXX

XXXXXX X X

S

A2 A1 A0

A

A

A

A P

Address

High 8bits

Address

Low 8bits

Write

Data 8bits

0

1

010

Access from master

Access from slave

Start Condition

Stop Condition

ACK (SDA is the "L" level)

A

S

P

S

A2 A1 A0

A

A

A

A

A P

Address

High 8bits

Address

Low 8bits

Write

Data 8bits

Write

Data

...

0

1

010

Access from master

Access from slave