ACE25C200

2MB Serial Flash Memory

VER 1.2

24

Figure 22 Read JEDEC ID instruction

Enter OTP Mode (3Ah)

This Flash has an extra 256 bytes security sector, user must issue ENTER OTP MODE command to

read, program or erase security sector. After entering OTP mode, the security sector is mapping to

sector 63, SRP bit becomes LB and can be read with RDSR command. Program / Erase command

will be disabled when LB is ‘1’

WRSR command will ignore the input data and program LB to 1. User must clear the protect bits

before enter OTP mode.

Security sector can only be program and erase before LB equal ‘1’ and BP[2:0] = ‘000’. In OTP mode,

user can read other sectors, but program/erase o

ther sectors only allowed when LB equal ‘0’.

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

Sector

Sector size

Adress range

63

256 byte

07F000h-07F0FFh

Table 6 Security sector adress

Note: The secruty sector is mapping to sector 63