T25S16AFEPR datasheet(60/74 Pages) HMSEMI

60 / 74 page

the Status Registers. The Individual Block/Sector Lock bits are volatile bits. The default values after device

power up or after a Reset are 1, so the entire memory array is being protected.

To lock a specific block or sector as illustrated in Figure 6.2, an Individual Block/Sector Lock command

must be issued by driving CS# low, shifting the instruction code “36h” into the Data Input (DI) pin on the rising

edge of CLK, followed by a 24-bit address and then driving CS# high. A Write Enable instruction must be

executed before the device will accept the Individual Block/Sector Lock Instruction (Status Register bit WEL=

1).

Figure 7.36a Individual Block/Sector Lock Instruction(SPI Mode)

Figure 7.36b Individual Block/Sector Lock Instruction(QPI Mode)

7.5.10 Individual Block/Sector Unlock (39h)

The Individual Block/Sector Lock provides an alternative way to protect the memory array from adverse

Erase/Program. In order to use the Individual Block/Sector Locks, the WPS bit in Status Register-3 must be

set to 1. If WPS=0, the write protection will be determined by the combination of CMP, SEC, TB, BP[2:0] bits in

the Status Registers. The Individual Block/Sector Lock bits are volatile bits. The default values after device

power up or after a Reset are 1, so the entire memory array is being protected.

To unlock a specific block or sector as illustrated in Figure 6.2, an Individual Block/Sector Unlock

command must be issued by driving CS# low, shifting the instruction code “39h” into the Data Input (DI) pin on

the rising edge of CLK, followed by a 24-bit address and then driving CS# high. A Write Enable instruction

must be executed before the device will accept the Individual Block/Sector Unlock Instruction(Status Register

bit WEL= 1).

Figure 7.37a Individual Block/Sector Unlock Instruction(SPI Mode)

HM25Q128A

T25S16AFEPR Datenblatt(PDF) 60 Page - Shenzhen Huazhimei Semiconductor Co., Ltd