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Problems with Programming Configuration Register-1 (CR1) on S25FL-S FLASH Memory - KBA231885

Problems with Programming Configuration Register-1 (CR1) on S25FL-S FLASH Memory - KBA231885

ChaitanyaV_61
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Question: When using the Write Register command (WRR 01h), programming the Configuration Register-1 from 0x00 to 0x20 is successful, but when programming from 0x20 back to 0x00, programming is unsuccessful and the Status Register-1, Bit-6 (SR1[6]) is set to “1” (programming error occurred).  What may be causing the problem?

Answer: The issue is that when programming, the value 0x20 to Configuration Register-1, Bit 5 (CR1[5]) is One-Time Programmable (OTP).  Therefore, any attempt to change CR1[5] back to “0” will fail and the Status Register-1, Bit 6 (P_ERR in SR1[6]) will be set to “1” indicating the occurrence of a programming error. The same error is expected for Configuration Register-1, Bits 4, 3, and 2 (CR1[4:2]). When set to “1”, the Programming Error bit can be reset to “0” with the Clear Status Register (CLSR 30h) command.

Configuration Register-1 (CR1)

Bit

7

6

5

4

3

2

1

0

Register Type

Nonvolatile

Nonvolatile

OTP

OTP

OTP

OTP

Nonvolatile

Volatile

-

Default Value

0

0

0

0

0

0

0

0

0x00

Desired Programmed Value

0

0

1

0

0

0

0

0

0x20

    

Configuration Register-1, Bits 5, 4, 3, 2 (CR1[5:2]) are OTP bits.

For more details, see S25FL-S Datasheet.

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