m95512-r STMicroelectronics, m95512-r Datasheet - Page 11

• Manufacturer Part Number: m95512-r
• Description: 512kbit Serial Spi Bus Eeprom With High Speed Clock
• Manufacturer: STMicroelectronics

M95512-W, M95512-R
3.1
The typical value of R is 100 k , assuming that the time constant R*C
capacitance of the bus line) is short enough, as the S and C lines must reach the correct
state (S = High and C = Low) while the SPI bus is in high impedance.
Example: C
Master never leaves the SPI bus in the high impedance state for a time period shorter than
5 µs.
SPI modes
These devices can be driven by a microcontroller with its SPI peripheral running in either of
the two following modes:
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
bus master is in Stand-by mode and not transferring data:
Figure 4.
CPOL
0
1
CPOL=0, CPHA=0
CPOL=1, CPHA=1
C remains at 0 for (CPOL=0, CPHA=0)
C remains at 1 for (CPOL=1, CPHA=1)
CPHA
0
1
C
C
D
Q
p
SPI modes supported
= 50 pF, that is R*C
MSB
p
= 5 µs <=> the application must ensure that the Bus
Figure
4, is the clock polarity when the
MSB
Connecting to the SPI bus
p
(C
p
= parasitic
AI01438B
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