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Atmel AT34C02C
Figure 4-5.
Output acknowledge
5.
6.
Device addressing
The 2K EEPROM device requires an 8-bit device address word following a start condition to enable the chip for a read or
write operation (see Figure 8-1 on page 12 ).
The device address word consists of a mandatory one-zero sequence for the first four most-significant bits (1010) for
normal read and write operations and 0110 for writing to the write protect register.
The next three bits are the A2, A1, and A0 device address bits for the Atmel AT34C02C EEPROM. These three bits must
compare to their corresponding hard-wired input pins.
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. The device will not acknowledge if the write protect register has been programmed and the control code is
0110.
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 (see Figure 8-2 on page 12 ).
The device will acknowledge a write command, but not write the data, if the software or hardware write protection has
been enabled. The write cycle time must be observed even when the write protection is enabled.
PAGE WRITE: The 2K device is capable of 16-byte page write.
A page write is initiated the same 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 8-3 on page 12 ).
7
5185E–SEEPR–3/11
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