m35b32 STMicroelectronics, m35b32 Datasheet - Page 11

• Manufacturer Part Number: m35b32
• Description: 32 Kbit, 256-byte Page, Fast Program Eeprom Memory Accessed By Spi Bus Interface
• Manufacturer: STMicroelectronics

M35B32
Note:
1
Figure 4.
The /W and /RESET inputs are CMOS inputs and have also to be driven high or low if/when the SPI
bus master leaves the lines in high impedance. This has to be done with the help of pull up or pull
down resistors (depending on the application requirements).
Figure 4
device is selected at a time, so only one device drives the Serial Data Output (Q) line at a
time, the other devices are high impedance.
A pull-up resistor connected on each /S input (represented in
slave device on the SPI bus is not selected if the bus master leaves the /S line in the high
impedance state.
In applications where the bus master might enter a state where all inputs/outputs SPI lines
are in high impedance at the same time (for example, if the Bus Master is reset during the
transmission of an instruction), the clock line (C) must be connected to an external pull-
down resistor so that, if all inputs/outputs become high impedance, the C line is pulled low
(while the S line is pulled high). This ensures that S and C do not become high at the same
time, and so, that the t
shows an example of three devices connected to an MCU, on an SPI bus. Only one
Bus master and memory devices on the SPI bus
SHCH
requirement is met.
Doc ID 18391 Rev 3
Figure
4) ensures that each
SPI modes
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