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M95320 Просмотр технического описания (PDF) - STMicroelectronics

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M95320 Datasheet PDF : 39 Pages
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M95640, M95320
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
Instruc
tion
Description
WREN Write Enable
WRDI Write Disable
RDSR Read Status Register
WRSR Write Status Register
READ Read from Memory Array
WRITE Write to Memory Array
Figure 9. Write Enable (WREN) Sequence
Instruction
Format
0000 0110
0000 0100
0000 0101
0000 0001
0000 0011
0000 0010
S
01234567
C
Instruction
D
High Impedance
Q
AI02281E
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.
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