ST10F272M_12 datasheet(37/176 Pages) STMICROELECTRONICS

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ST10F272M

Internal Flash memory

Doc ID 12968 Rev 3

37/176

5.5.5

Flash non-volatile access protection register 1 high (FNVAPR1H)

5.5.6

X-bus Flash volatile temporary access unprotection register

(XFVTAUR0)

Table 21.

Flash non-volatile access protection register 1 low

Bit

Name

Function

15:0 PDS[15:0]

Protections disable 15-0

If bit PDSx is programmed at 0 and bit PENx is erased at 1, the action of bit ACCP

is disabled. Bit PDS0 can be programmed at 0 only if both bits DBGP and ACCP

have already been programmed at 0. Bit PDSx can be programmed at 0 only if bit

PENx-1 has already been programmed at 0.

FNVAPR1H (0x08 DFBE)

NVR

Delivery value: FFFFh

765

210

PEN15PEN14PEN13PEN12PEN11PEN10 PEN9 PEN8 PEN7 PEN6 PEN5 PEN4 PEN3 PEN2 PEN1 PEN0

Table 22.

Flash non-volatile access protection register 1 high

Bit

Name

Function

15:0 PEN[15:0]

Protections enable 15-0

If bit PENx is programmed at 0 and bit PDSx+1 is erased at 1, the action of bit

ACCP is enabled again. Bit PENx can be programmed at 0 only if bit PDSx has

already been programmed at 0.

XFVTAUR0 (0x00 EB50)

NVR

Reset value: 0000h

765

210

Reserved

TAUB

-RW

Table 23.

X-bus Flash volatile temporary access unprotection register

Bit

Name

Function

0TAUB

Temporary access unprotection bit

If this bit is set to 1, the access protection is temporary disabled. The fact that this

bit can be written only while executing from IFlash guarantees that only a code

executed in IFlash can unprotect the IFlash when it is access protected.

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