Datasheet

MB85RC256V
8 DS501-00017-3v0-E
■ 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 MB85RC256V, 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 (0000
H) 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 FRAM performs the high-speed write operations, the
data will be written to FRAM 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
0XXXXXXX XXXXXXXX
S
A2 A1 A0 A A A A P
Address
High 8bits
Address
Low 8bits
Write
Data 8bits
01010
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
...
01010
Access from master
Access from slave