UM0116 datasheet(22/27 Pages) STMICROELECTRONICS

22 / 27 page

Flash memory protection

UM0116

22/27

3.4.2

Flash NV access protection register 0 (FLASH_NVAPR0)

Address offset: 0x10 DFB8

Delivery value: 0x3569 ACFFh

1) Not available in STR75x.

2) Not available in STR71x and STR73x.

Reserved

5432

Reserved

DEBUG

READ

OUT2)

Bit 31:2

Reserved, always read as 0.

Bit 1

DEBUG: Debug Protection.

If this bit is erased to 1, protections are by-passed and the Flash is

accessible through its JTAG interface.

If DEBUG is programmed at 0 the device is DEBUG protected, the JTAG

interface is disabled.

Note:

In STR73x devices, when debug protection is enabled, the

SystemMemory Mode is also disabled.

Note:

If this bit is programmed to ‘0’, STMicroelectronics will not be

able to access the device to run a possible failure analysis.

Bit 0

READOUT: Readout Protection.

If this bit is erased to 1, protections are by-passed and the Flash is

accessible through its JTAG interface.

If READOUT is programmed at 0 the device is READOUT protected, the

JTAG interface is disabled.

Note:

If this bit is programmed to ‘0’, STMicroelectronics will not be

able to access the device to run a possible failure analysis.

UM0116 Datasheet(PDF) 22 Page - STMicroelectronics