M95640 datasheet(12/39 Pages) STMICROELECTRONICS

12 / 39 page

M95640, M95320

12/39

INSTRUCTIONS

Each instruction starts with a single-byte code, as

summarized in Table 4.

If an invalid instruction is sent (one not contained

in Table 4), the device automatically deselects it-

self.

Table 4. Instruction Set

Figure 9. Write Enable (WREN) Sequence

Write Enable (WREN)

The Write Enable Latch (WEL) bit must be set pri-

or to each WRITE and WRSR instruction. The only

way to do this is to send a Write Enable instruction

to the device.

As shown in Figure 9, to send this instruction to the

device, Chip Select (S) is driven Low, and the bits

of the instruction byte are shifted in, on Serial Data

Input (D). The device then enters a wait state. It

waits for a the device to be deselected, by Chip

Select (S) being driven High.

Instruc

tion

Description

Instruction

Format

WREN

Write Enable

0000 0110

WRDI

Write Disable

0000 0100

RDSR

Read Status Register

0000 0101

WRSR

Write Status Register

0000 0001

READ

Read from Memory Array

0000 0011

WRITE

Write to Memory Array

0000 0010

AI02281E

34567

High Impedance

Instruction

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