M95320 Просмотр технического описания (PDF) - STMicroelectronics

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M95320

64Kbit and 32Kbit Serial SPI Bus EEPROM With High Speed Clock

STMicroelectronics 

Figure 10. Write Disable (WRDI) Sequence

M95640, M95320

S

01234567

C

Instruction

D

High Impedance

Q

AI03750D

Write Disable (WRDI)

One way of resetting the Write Enable Latch

(WEL) bit is to send a Write Disable instruction to

the device.

As shown in Figure 10, 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) be-

ing driven High.

The Write Enable Latch (WEL) bit, in fact, be-

comes reset by any of the following events:

– Power-up

– WRDI instruction execution

– WRSR instruction completion

– WRITE instruction completion.

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