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EN25F20

2 Mbit Serial Flash Memory with 4Kbytes Uniform Sector

Eon Silicon Solution Inc. 

EN25F20

Figure 6. Write Disable Instruction Sequence Diagram

Read Status Register (RDSR) (05h)

The Read Status Register (RDSR) instruction allows the Status Register to be read. The Status

Register may be read at any time, even while a Program, Erase or Write Status Register cycle is in

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, as shown in Figure 7.

Figure 7. Read Status Register Instruction Sequence Diagram

Table 6. Status Register Bit Locations

S7

S6

S5

S4

S3

S2

S1

S0

SRP OTP_LOCK

Status Register

bit

Protect

(note 1)

BP2

BP1

BP0

WEL

WIP

(Block Protected (Block Protected (Block Protected (Write Enable (Write In

bits)

bits)

bits)

Latch)

Progress bit)

1 = status

register write

disable

1 = OTP

sector is

protected

Reserved Reserved

bits

bits

(note 2)

(note 2)

(note 2)

1 = write

enable

0 = not write

enable

1 = write

operation

0 = not in write

operation

Non-volatile bit

Non-volatile bit Non-volatile bit Non-volatile bit volatile bit

volatile bit

Note

1. In OTP mode, SRP bit is served as OTP_LOCK bit.

2. See the table “Protected Area Sizes Sector Organization”.

This Data Sheet may be revised by subsequent versions

11

or modifications due to changes in technical specifications.

©2004 Eon Silicon Solution, Inc.,

Rev. E, Issue Date: 2008/12/15

www.eonssi.com

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