9
AT24C16C [DATASHEET]
Atmel-8719D-SEEPROM-AT24C16C-Datasheet_122016
7.
Device Addressing
Standard EEPROM Access:
The 16K EEPROM device requires an 8-bit device address word following a Start
Condition to enable the chip for a Read or Write operation. The device address word consists of a mandatory
“1010”
(Ah) sequence for the first four Most Significant Bits (MSB) as shown in
Figure 10. on page 12
. This is
common to all the EEPROM devices.
The next three bits used for memory page addressing are the most significant bits of the data word address
which follows.
The eighth bit of the device address is the Read/Write operation select bit. A Read operation is initiated if this bit
is high and a Write operation is initiated if this bit is low.
Upon a compare of the device address, the EEPROM will output a zero. If a compare is not made, the chip will
return to a standby state.
Figure 7-1.
Device Address
8.
Write Operations
Byte Write:
A Write operation requires an 8-bit data word address following the device address word and
acknowledgment. Upon receipt of this address, the EEPROM will again respond with a zero and then clock in
the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output a zero and the
addressing device, such as a microcontroller, must terminate the Write sequence with a Stop Condition. At this
time the EEPROM enters an internally timed write cycle, t
WR
, to the nonvolatile memory. All inputs are disabled
during this write cycle and the EEPROM will not respond until the Write is complete.
Figure 8-1.
Byte Write
Page Write:
The 16K EEPROM devices are capable of a 16-byte Page Write.
A Page Write is initiated in the same way as a Byte Write, but the microcontroller does not send a Stop
Condition after the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first
data word, the microcontroller can transmit up to fifteen more data words. The EEPROM will respond with a
zero after each data word received. The microcontroller must terminate the Page Write sequence with a Stop
Condition (see
Figure 8-2
).
Density
Access Area
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
16K
EEPROM
1
0
1
0
P2
P1
P0
R/W
MSB
LSB
SDA Line
S
T
A
R
T
W
R
I
T
E
S
T
O
P
Device
Address
Word Address
Data
M
S
B
A
C
K
A
C
K
A
C
K
R
/
W
