MB85RC256VPF-G Datasheet, PDF (8/36 Pages) Fujitsu Component Limited. – FUJITSU SEMICONDUCTOR

MB85RC256V
■ 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.
S 1 0 1 0 A2 A1 A0 0 A
Address
High 8bits
A
Address
Low 8bits
A
Write
Data 8bits
AP
0 XXXXXXX
MSB
X X X X X X XX
LSB
Access from master
Access from slave
S Start Condition
P Stop Condition
A ACK (SDA is the "L" level)
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 (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 FRAM performs the high-speed write operations, the
data will be written to FRAM right after the ACK response finished.
S 1 0 1 0 A2 A1 A0 0 A
Address
High 8bits
A
Address
Low 8bits
A
Write
Data 8bits
A
Write
Data
... A P
Access from master
Access from slave
S Start Condition
P Stop Condition
A ACK (SDA is the "L" level)
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.
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DS501-00017-3v0-E