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M95040-MN

4Kbit, 2Kbit and 1Kbit Serial SPI Bus EEPROM With High Speed Clock

STMicroelectronics 

M95040, M95020, M95010

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 5. SPI Modes Supported

CPOL CPHA

0

0

C

1

1

C

D

Q

MSB

MSB

AI01438B

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