ACE24C256C Datasheet, PDF (9/20 Pages) ACE Technology Co., LTD. – Two-wire serial EEPROM

ACE24C256C
Two-wire serial EEPROM
Instructions
Write Operations
(A) Byte Write
A write operation requires two 8-bit data word address (A14/A0) following the device address word and
acknowledgment. Upon receipt of this address, the ACE24C256C will again respond with a “0” and then
clock in the first 8-bit data word. Following receipt of the 8-bit data word, the ACE24C256C will output a
“0” and the addressing device, such as a microcontroller, must terminate the write sequence with a stop
condition. And then the ACE24C256C enters an internally timed write cycle, all inputs are disabled during
this write cycle and the ACE24C256C will not respond until the write is complete (see Figure 8).
Notes: x means don’t care.
Figure8：Byte Write
(B) Page Write
A page write is initiated the same as a byte write, but the master does not send a stop condition after
the first data word is clocked in. Instead, after the ACE24C256C acknowledges receipt of the first
data word, the master can transmit more data words. The ACE24C256C will respond with a “0” after
each data word received. The microcontroller must terminate the page write sequence with a stop
condition.
Figure9：Page Write
The lower six bits of the data word address are internally incremented following the receipt of each data
word. The higher data word address bits are not incremented, retaining the memory page row location.
When the word address, internally generated, reaches the page boundary, the following byte is placed at
the beginning of the same page. If more than 64 data words are transmitted to the ACE24C256C, the data
word address will roll-over, and previous data will be overwritten. The address roll-over during write is
from the last byte of the current page to the first byte of the same page.
VER 1.2 9