M25PE80-VMP6G STMicroelectronics, M25PE80-VMP6G Datasheet - Page 36

• Manufacturer Part Number: M25PE80-VMP6G
• Description: SERIAL FLASH
• Manufacturer: STMicroelectronics

Instructions
6.11
36/61
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
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 t
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.
1. The table rows in gray are true for products processed in the T7Y process only (see
All Sectors in T9HX process
All Sectors except for Sector 0
and Sector 15 in T7Y process
S
C
D
page
6).
Figure
Sector
Lock Register In
0
17. Chip Select (S) must be driven High after the eighth bit of the data Byte
1
2
Instruction
3
4
5
(1)
b7-b2
6
Bit
b1
b0
7
MSB
23
8
Sector Lock Down Bit Value (refer to
Sector Write Lock Bit Value (refer to
22 21
9 10
24-Bit Address
3
28 29 30 31 32 33 34 35
2
1
0
MSB
7
SHSL
Value
6
‘0’
Lock Register
5
minimum value.
4
In
Table
3
Important note on
36 37 38
Table
2
11)
11)
1
0
39
M25PE80
AI10784