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M95256-R データシート(PDF) 7 Page - STMicroelectronics

部品番号 M95256-R
部品情報  256-Kbit serial SPI bus EEPROM with high-speed clock
PDF  51 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M95256-R データシート(HTML) 7 Page - STMicroelectronics

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4.1
SPI modes
These devices can be driven by a microcontroller with its SPI peripheral running in either of the following two
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 6, 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 6. SPI modes supported
MSB
MSB
C
D
Q
C
CPOL
0
1
CPHA
0
1
M95256-W M95256-R M95256-DF
SPI modes
DS4712 - Rev 22
page 7/51



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