FT24C02A データシートの表示（PDF） - Unspecified
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FT24C02A Datasheet PDF : 20 Pages
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FT24C02A
(C) RANDOM READ
Random read is a two-steps process. The first step is to initialize the internal address counter with a
target read address using a “dummy write” instruction. The second step is a current address read.
To initialize the internal address counter with a target read address, the micro-controller issues a
START bit first, follows by a valid device address with the read/write bit (8th) set to “0”. The EEPROM
will then acknowledge. The micro-controller will then send the address word. Again the EEPROM
will acknowledge. Instead of sending a valid written data to the EEPROM, the micro-controller
performs a current address read instruction to read the data. Note that once a START bit is issued,
the EEPROM will reset the internal programming process and continue to execute the new instruction
- which is to read the current address.
S
W
T
R
A
R
T
DEVICE
ADDRESS
I
T
E
SDA LINE
***
WORD
ADDRESS
S
T
O
DATA
P
M
LRAM
LA
A
S
S / CS
SC
C
B
B WK B
BK
K
Figure 5: Byte Write
S
W
T
R
A
R
T
DEVICE
ADDRESS
I
T
E
SDA LINE
***
WORD
ADDRESS(N)
M
LRAM
LA
S
S / CS
SC
B
B WK B
BK
DATA(N)
...
A
C
K
Figure 6: Page Write
S
T
O
P
DATA(N+X)
A
C
K
S
T
A
R DEVICE
T ADDRESS
R
E
A
D
DATA
S
T
O
P
SDA LINE
***
M
LRA
N
S
S/C
O
B
B WK
A
C
K
Figure 7: Current Address Read
DS3011B-page8
© 2009 Fremont Micro Devices Inc.
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