MB85RC64A

DS501-00019-5v2-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 MB85RC64A, input “000” as the upper 3 bits of the MSB.

• 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 8 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 0 0 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