ST95040 ST Microelectronics, ST95040 Datasheet - Page 5

• Manufacturer Part Number: ST95040
• Description: (ST950x0) 4K/2K/1K Serial SPI EEPROM with Positive Clock Strobe
• Manufacturer: ST Microelectronics

Figure 5. Block Diagram
During a write to the memory operation to the
memory array, all bits BP1, BP0, WEL, WIP are
valid and can be read. During a write to the status
register, only the bits WEL and WIP are valid and
can be read. The values of BP1 and BP0 read at
that time correspond to the previouscontents of the
status register.
The Write-In-Process (WIP) read-only bit indicates
whether the Memory is busy with a write operation.
HOLD
W
Q
S
C
D
Address Register
Control Logic
and Counter
I/O Shift Register
High Voltage
When set to a ’1’ a write is in progress, when set to
a ’0’ no write is in progress.
The Write Enable Latch (WEL) read-only bit indi-
cates the status of the write enable latch. When set
to a ’1’ the latch is set, when set to a ’0’ the latch is
reset. The Block Protect (BP0 and BP1) bits indi-
cate the extent of the protection employed. These
bits are set by the user issuing the WRSR instruc-
tion. These bits are non-volatile.
Generator
Register
X Decoder
Data
16 Bytes
ST95040, ST95020, ST95010
Status
Block
Protect
AI01272
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