HT24LC02
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Random read
Sequential read
Arandom read requires a dummy byte write sequence
to load in the data word address which is then clocked
in and acknowledged by the EEPROM. The
microcontroller must then generate another start con-
dition. The microcontroller now initiates a current ad-
dress read by sending a device address with the
read/write select bit high. The EEPROM acknowl-
edges the device address and serially clocks out the
data word. The microcontroller should respond with a
²no ACK² signal (high) followed by a stop condition.
(refer to Random read timing).
Sequential reads are initiated by either a current ad-
dress read or a random address read. After the
microcontroller receives a data word, it responds with an
acknowledgment. As long as the EEPROM receives an
acknowledgment, it will continue to increment the data
word address and serially clock out sequential data
words. When the memory address limit is reached, the
data word address will roll over and the sequential read
continues. The sequential read operation is terminated
when the microcontroller responds with a ²no ACK² sig-
nal (high) followed by a stop condition.
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Timing Diagrams
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The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the valid start
condition of sequential command.
Note:
Rev. 1.70
6
May 6, 2010
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
