ACE25QC800GLMMTH datasheet(21/58 Pages) ACE

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ACE25QC800G

8M BIT SPI NOR FLASH

VER 1.2

Read Status Register (05H or 35H)

See Figure 4 the Read Status Register (RDSR) instruction is for reading the Status Register. The Status

progress. When one of these cycles is in progress, it is recommended to check the Write in Progress (WIP)

bit before sending a new instruction to the device. It is also possible to read the Status Register

continuously. For instruction code “05H”, the SO will output Status Register bits S7~S0. The instruction

code “35H”, the SO will output Status Register bits S15~S8, The instruction code “15H”, the SO will output

Status Register bits S23~16.

Write Status Register (01H or 31H)

See Figure 5, the Write Status Register instruction allows new values to be written to the Status Register.

Before it can be accepted, a Write Enable instruction must previously have been executed. After the Write

Enable instruction has been decoded and executed, the device sets the Write Enable Latch (WEL).

The Write Status Register instruction has no effect on S23, S20, S19, S18, S17, S16, S15, S1 and S0 of

the Status Register. /CS must be driven high after the eighth bit of the data byte has been latched in. If not,

the Write Status Register instruction is not executed. As soon as /CS is driven high, the self-timed Write

Status Register cycle (whose duration is tW) is initiated. While the Write Status Register cycle is in progress,

the Status Register may still be read to check the value of the Write in Progress (WIP) bit. The Write in

Progress (WIP) bit is 1 during the self-timed Write Status Register cycle, and is 0 when it is completed.

When the cycle is completed, the Write Enable Latch is reset.

The Write Status Register instruction allows the user to change the values of the Block Protect (BP4, BP3,

BP2, BP1, BP0) bits, to define the size of the area that is to be treated as read-only, as defined in Table 3.

The Write Status Register instruction also allows the user to set or reset the Status Register Protect (SRP1

and SRP0) bits in accordance with the Write Protect (/WP) signal. The Status Register Protect (SRP1 and

SRP0) bits and Write Protect (/WP) signal allow the device to be put in the Hardware Protected Mode. The

Write Status Register instruction is not executed once the Hardware Protected Mode is entered.

Figure4. Read Status Register Sequence Diagram

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