EN25QH16A Datasheet, PDF (45/66 Pages) Eon Silicon Solution Inc. – 16 Megabit Serial Flash Memory with 4Kbyte Uniform Sector

EN25QH16A
Figure 28.1. Read Identification (RDID) in QPI Mode
Enter OTP mode (3Ah)
This Flash support OTP mode to enhance the data protection, user can use the Enter OTP mode (3Ah)
command for entering this mode. In OTP mode, the Status Register S7 bit is served as OTP_LOCK bit;
S6 bit is served as TB bit; S4 bit is served as 4KB BL bit, S3 bit is served as EBL bit, S1 bit is served as
WEL bit and S0 bit is served as WIP bit. They can be read by RDSR command.
This Flash has an extra 512 bytes OTP sector, user must issue Enter OTP mode command to read,
program or erase OTP sector. After entering OTP mode, the OTP sector is mapping to sector 511, SRP
bit becomes OTP_LOCK bit. The Chip Erase, Block Erase and Half Block Erase commands are also
disabled.
In OTP mode, user can read other sectors, but program/erase OTP sector only allowed when
OTP_LOCK bit equal to ‘0’. The OTP sector can only be erased by Sector Erase (20h) command.
Table 8. OTP Sector Address
Sector
Sector Size
Address Range
511
512 byte
1FF000h – 1FF1FFh
Note: The OTP sector is mapping to sector 511.
The Enable Boot Lock feature is configured in OTP mode. It enables user to lock the 64KB-
Block/Sector on the top/bottom of the device for protection. This feature is activated by programming
the EBL bit to ‘1‘. WRSR command is used to program OTP_LOCK bit, TB bit, 4KB BL bit and EBL bit
to ‘1‘, but these bits only can be programmed once. User can use WRDI (04h) command to exit OTP
mode.
The instruction sequence is shown in Figure 29.1 while using the Enable Quad Peripheral Interface mode
(EQPI) (38h) command.
This Data Sheet may be revised by subsequent versions
45
or modifications due to changes in technical specifications.
©2013 Eon Silicon Solution, Inc.,
Rev. A, Issue Date: 2013/11/25
www.eonssi.com