M58MR032C datasheet(15/52 Pages) STMICROELECTRONICS

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M58MR032C, M58MR032D

Table 13. Protection States (1)

Note: 1. All blocks are protected at power-up, so the default configuration is 001 or 101 according to WP status.

2. Current state and Next state gives the protection status of a block. The protection status is defined by the write protect in and by

DQ1 (= 1 for a locked block) and DQ0 (= 1 for a protected block) as read in the Read Electronic Signature instruction with A1 = VIH

and A0 = VIL.

3. Next state is the protection status of a block after a Protect or Unprotect or Lock command has been issued or after WP has changed

its logic value.

4. A WP transition to VIH on a locked block will restore the previous DQ0 value, giving a 111 or 110.

Current State (2)

(WP, DQ1, DQ0)

Program/Erase

Allowed

Next State After Event (3)

Protect

Unprotect

Lock

WP transition

100

Yes

101

100

111

000

101

100

111

001

110

Yes

111

110

111

011

111

110

111

011

000

Yes

001

000

011

100

001

000

011

101

011

111 or 110 (4)

Figure 5. Security Block Memory Map

AI90023

Parameter Block # 0

User Programmable OTP

Unique device number

Protection Register Lock

88h

85h

84h

81h

80h

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