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ST95P08B3TR データシート(PDF) 9 Page - STMicroelectronics

部品番号 ST95P08B3TR
部品情報  SERIAL ACCESS SPI BUS 2K 256 x 8 EEPROM
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST95P08B3TR データシート(HTML) 9 Page - STMicroelectronics

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When the highest address is reached (FFh), the
address counter rolls over to 0h allowing the read
cycle to be continued indefinitely. The read opera-
tion is terminated by deselecting the chip. The chip
can be deselected at any time during data output.
Any read attempt during a non-volatile write cycle
will be rejected and will deselect the chip.
Byte Write Operation
Prior to any write attempt, the write enable latch
must have been set by issuing the WREN instruc-
tion. First, the device is selected (S = low) and a
serial WREN instruction byte is issued. Then, the
product is deselected by taking S high. After the
WREN instruction byte is sent, the ST95P02 will
set the write enable latch and then remain in
standby until it is deselected. Then, the write state
is entered by selecting the chip, issuing a one byte
address (A7-A0), and one byte of data. S must
remain low for the entire duration of the operation.
The product must be deselected just after the eigth
bit of data has been latched in. If not, the write
process is cancelled. As soon as the product is
deselected, the self-timed write cycle is initiated.
While the write is in progress, the status register
may be read to check BP1, BP0, WEL and WIP.
WIP is high during the self-timed write cycle. When
the cycle is close to completion, the write enable
latch is reset.
Page Write Operation
A maximum of 16 bytes of data may be written
during one non-volatile write cycle. All 16 bytes
must reside on the same page. The page write
mode is the same as the byte write mode except
that instead of deselecting after the first byte of
data, up to 15 additional bytes can be shifted in
prior to deselecting the chip. A page address begins
with address xxxx 0000 and ends with xxxx 1111.
If the address counter reaches xxxx 1111 and the
clock continues, the counter will roll over to the first
address of the page (xxxx 0000) and overwrite any
previous written data. The programming cycle will
only start if the S transition does occur at the clock
low pulse just after the eigth bit of data of a word is
received.
C
D
AI01259
S
Q
2
1
3456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23
7
65432
0
1
HIGH IMPEDANCE
DATA OUT
INSTRUCTION
BYTE ADDRESS
0
MSB
Figure 8. Read Operation Sequence
OPERATIONS (cont’d)
9/16
ST95P02


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