M25PE80 datasheet(37/66 Pages) NUMONYX

Part #	M25PE80

Description	8-Mbit, page-erasable serial flash memory with byte alterability, 75 MHz SPI bus, standard pinout

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Manufacturer	NUMONYX [Numonyx B.V]

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M25PE80

Instructions

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6.11

Write to lock register (WRLR)

The write to lock register (WRLR) instruction allows bits to be changed in the lock registers.

Before it can be accepted, a Write Enable (WREN) instruction must previously have been

executed. After the write enable (WREN) instruction has been decoded, the device sets the

write enable latch (WEL).

The write to lock register (WRLR) instruction is entered by driving Chip Select (S) Low,

followed by the instruction code, three address bytes (pointing to any address in the targeted

sector and one data byte on serial data input (D). The instruction sequence is shown in

Figure 17. Chip Select (S) must be driven High after the eighth bit of the data byte has been

latched in, otherwise the write to lock register (WRLR) instruction is not executed.

Lock register bits are volatile, and therefore do not require time to be written. When the write

to lock register (WRLR) instruction has been successfully executed, the write enable latch

(WEL) bit is reset after a delay time less than tSHSL minimum value.

Any write to lock register (WRLR) instruction, while an erase, program or write cycle is in

progress, is rejected without having any effects on the cycle that is in progress.

Figure 17.

Write to lock register (WRLR) instruction sequence

Table 12.

Lock register in(1)

1.

The table rows in gray are true for products processed in the T7Y process only (see Important note on

page 6).

Sector

Bit

Value

All sectors in T9HX process

All sectors except for sector 0

and sector 15 in T7Y process

b7-b2

‘0’

b1

Sector lock down bit value (refer to Table 11)

b0

Sector write lock bit value (refer to Table 11)

AI10784

C

D

S

23

2

1

3456789 10

28 29 30 31 32 33 34 35

22 21

3210

36 37 38

Instruction

24-bit address

0

765432

0

1

Lock register

in

39

MSB

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