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ST95010M3TR データシート(PDF) 4 Page - STMicroelectronics

部品番号 ST95010M3TR
部品情報  4K/2K/1K Serial SPI EEPROM with Positive Clock Strobe
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST95010M3TR データシート(HTML) 4 Page - STMicroelectronics

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Hold (HOLD). The HOLD pin is used to pause
serial communications with the Memory without
resetting the serial sequence. To take the Hold
condition into account, the product must be se-
lected (S = 0). Then the Hold state is validated by
a high to low transition on HOLD when C is low. To
resumethe communications,HOLDis broughthigh
while C is low. During the Hold condition D, Q, and
C are at a high impedance state.
When the Memory is under the Hold condition, it is
possibleto deselect the device. However, the serial
communications will remain paused after a rese-
lect, and the chip will be reset.
The Memory can be driven by a microcontroller with
its SPI peripheral running in either of the two fol-
lowing modes: (CPOL, CPHA) = (’0’, ’0’) or (CPOL,
CPHA) = (’1’, ’1’).
For these two modes, input data is latchedin by the
low to high transition of clock C, and output data is
available from the high to low transition of Clock
(C).
The differencebetween (CPOL, CPHA) = (0, 0) and
(CPOL, CPHA) = (1, 1) is the stand-by polarity: C
remains at ’0’ for (CPOL, CPHA) = (0, 0) and C
remains at ’1’for (CPOL, CPHA) = (1, 1) when there
is no data transfer.
OPERATIONS
All instructions, addresses and data are shifted in
and out of the chip MSB first. Data input (D) is
sampled on the first rising edge of clock (C) after
the chip select (S) goes low. Prior to any operation,
a one-byte instruction code must be entered in the
chip. This code is entered via the data input (D),
and latched on the rising edge of the clock input
(C). To enter an instruction code, the product must
have been previously selected (S = low). Table 3
shows the instruction set and format for device
operation. If an invalid instruction is sent (one not
contained in Table 3), the chip is automatically
deselected. For operations that read or write data
in the memory array, bit 3 of the instruction is the
MSB of the address, otherwise, it is a don’t care.
Write Enable (WREN) and Write Disable (WRDI)
The Memory contains a write enable latch. This
latch must be set prior to every WRITE or WRSR
operation. The WREN instruction will set the latch
and the WRDI instruction will reset the latch. The
latch is reset under the following conditions:
– W pin is low
– Power on
– WRDI instruction executed
– WRSR instruction executed
– WRITE instruction executed
As soon as the WREN or WRDI instruction is
received by the memory, the circuit executes the
instruction and enters a wait mode until it is dese-
lected.
Read Status Register (RDSR)
The RDSR instructionprovidesaccess to the status
register. The status register may be read at any
time, even during a write to the memory operation.
If a Read Status register reaches the 8th bit of the
Status register, an additional 9th clock pulse will
wrap around to read the 1st bit of the Status Reg-
ister
The status register format is as follows:
b7
b0
1
1
1
1
BP1
BP0
WEL
WIP
BP1, BP0: Read and write bits
WEL, WIP: Read only bits.
b7 to b4: Read only bits.
Instruction
Description
Instruction Format
WREN
Set Write Enable Latch
0000 0110
WRDI
Reset Write Enable Latch
0000 0100
RDSR
Read Status Register
0000 0101
WRSR
Write Status Register
0000 0001
READ
Read Data from Memory Array
0000 A8011
WRITE
Write Data to Memory Array
0000 A8010
Notes: A8 = 1, Upper page selected on ST95040.
A8 = 0, Lower page selected on ST95040.
Table 3. Instruction Set
4/18
ST95040, ST95020, ST95010


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