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M25P128 bảng dữ liệu(PDF) 9 Page - STMicroelectronics

tên linh kiện M25P128
Giải thích chi tiết về linh kiện  128 Mbit (Multilevel), Low Voltage, Serial Flash Memory With 50MHz SPI Bus Interface
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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M25P128 bảng dữ liệu(HTML) 9 Page - STMicroelectronics

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M25P128
SPI modes
Rev. 1
9/41
3
SPI modes
These devices can be driven by a microcontroller with its SPI peripheral running in either of
the two following modes:
●
CPOL=0, CPHA=0
●
CPOL=1, CPHA=1
For these two modes, input data is latched in on the rising edge of Serial Clock (C), and
output data is available from the falling edge of Serial Clock (C).
The difference between the two modes, as shown in Figure 5, is the clock polarity when the
bus master is in Stand-by mode and not transferring data:
●
C remains at 0 for (CPOL=0, CPHA=0)
●
C remains at 1 for (CPOL=1, CPHA=1)
Figure 4.
Bus Master and Memory Devices on the SPI Bus
1.
The Write Protect (W) and Hold (HOLD) signals should be driven, High or Low as appropriate.
Figure 5.
SPI Modes Supported
AI03746e
Bus Master
(ST6, ST7, ST9,
ST10, Others)
SPI Memory
Device
SDO
SDI
SCK
CQD
S
SPI Memory
Device
CQD
S
SPI Memory
Device
CQD
S
CS3
CS2
CS1
SPI Interface with
(CPOL, CPHA) =
(0, 0) or (1, 1)
W
HOLD
W
HOLD
W
HOLD
R(2)
R(2)
R(2)
VCC
VCC
VCC
VCC
AI01438B
C
MSB
CPHA
D
0
1
CPOL
0
1
Q
C
MSB



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