EN25B32-75VIP datasheet(25/38 Pages) EON

25 / 38 page

This Data Sheet may be revised by subsequent versions

or modifications due to changes in technical specifications.

EN25B32

Rev. C, Issue Date: 2007/06/21

Enter OTP Mode (3Ah)

This Flash has a extra 512 bytes OTP sector, user must issue ENTER OTP MODE command to enter

OTP mode before reading / programming or erasing OTP sector. After entering OTP mode, the OTP

sector is mapping to sector 0 ( bottom boot ) or sector 67 ( top boot ) respectively,

SRP bit becomes

OTP_LOCK bit and can be reading by RDSR command. Program / Erase command will be disabled when

OTP_LOCK is ‘1’

WRSR command will ignore the input data and program LOCK_BIT to 1.

User must clear the protect bits before enter OTP mode.

OTP sector can only be program and erase when LOCK_BIT equal ‘0’ and sector 0 ( bottom boot ) or

sector 67 ( top boot ) not protected. In OTP mode, user can read other sectors, but program/erase other

sectors only allowed when OTP_LOCK equal ‘0’.

User can use WRDI (04H) command to exit OTP mode.

Figure 19. Enter OTP Mode

Table 7a. Bottom Boot Security Sector Address

Sector Size

(bytes)

Address Range

Byte mode (x8)

512

000000h – 0001FFh

Table 7b. Top Boot Security Sector Address

Sector Size

(bytes)

Address Range

Byte mode (x8)

512

3FFE00h – 3FFFFFh

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