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ACE24AC1024DDPUH Datenblatt(PDF) 6 Page - ACE Technology Co., LTD.

Teilenummer ACE24AC1024DDPUH
Bauteilbeschribung  Two-wire Serial EEPROM
Download  13 Pages
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Hersteller  ACE [ACE Technology Co., LTD.]
Direct Link  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

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ACE24AC1024D
Two-wire Serial EEPROM
VER 1.2
6
(B)
Page Write
The 1024K EEPROM are capable of 256-byte page write.
A page write is initiated the same way as a byte write, but the microcontroller does not send a stop
condition after the first data word is clocked in. The microcontroller can transmit up to 255 more data
words after the EEPROM acknowledges receipt of the first data word. The EEPROM will respond
with a “0” after each data word is received. The microcontroller must terminate the page write
sequence with a stop condition (see Figure 4).
The lower 8 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.
If more than 256 data words are transmitted to the EEPROM, the data word address will
“roll over” and the previous data will be overwritten.
(C)
Acknowledge Polling
Acknowledge polling may be used to poll the programming status during a self-timed internal
programming. By issuing a valid read or write address command, the EEPROM will not acknowledge
at the 9
th
clock cycle if the device is still in the self-timed programming mode. However, if the
programming completes and the chip has returned to the standby mode, the device will return a valid
acknowledge signal at the 9
th
clock cycle.
Read Operations
The read command is similar to the write command except the 8
th
read/write bit in address word is set to
“1”. The three read operation modes are described as follows:
(A)
Current Address Read
The EEPROM internal address word counter maintains the last read or write address plus one if the
power supply to the device has not been cut off. To initiate a current address read operation, the
micro- controller issues a start bit and a valid device address word with the read/write bit (8
th
) set to
“1”. The EEPROM will response with an acknowledge signal on the 9th serial clock cycle. An 8-bit
data word will then be serially clocked out. The internal address word counter will then automatically
increase by one.
For current address read the micro-controller will not issue an acknowledge signal
on the 18
th
clock cycle. The micro-controller issues a valid stop bit after the 18
th
clock cycle to
terminate the read operation.
The device then returns to standby mode (see Figure 5).
(B)
Sequential Read
The sequential read is very similar to current address read. The micro-controller issues a start bit
and a valid device address word with read/write bit (8
th) set to “1”. The EEPROM will response with
an acknowledge signal on the 9
th
serial clock cycle.
An 8-bit data word will then be serially clocked
out. Meanwhile the internally address word counter will then automatically increase by one.
Unlike current address read, the micro-controller sends an acknowledge signal on the 18
th
clock


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