ST10F276Z5 STMicroelectronics, ST10F276Z5 Datasheet - Page 38
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ST10F276Z5
Manufacturer Part Number
ST10F276Z5
Description
16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
Manufacturer
STMicroelectronics
Datasheet
1.ST10F276Z5.pdf
(239 pages)
Specifications of ST10F276Z5
Single Voltage Supply
5V ±10% (embedded regulator for 1.8 V core supply)
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Internal Flash memory
4.5
4.5.1
4.5.2
38/239
Protection strategy
The protection bits are stored in Non Volatile Flash cells inside XFLASH module, that are
read once at reset and stored in 7 Volatile registers. Before they are read from the Non
Volatile cells, all the available protections are forced active during reset.
The protections can be programmed using the Set Protection operation (see Flash Control
Registers paragraph), that can be executed from all the internal or external memories
except from the Flash Bank B2.
Two kind of protections are available: write protections to avoid unwanted writings and
access protections to avoid piracy. In next paragraphs all different level of protections are
shown, and architecture limitations are highlighted as well.
Protection registers
The 7 Non Volatile Protection Registers are one time programmable for the user.
Four registers (FNVWPXRL/H-FNVWPIRL/H) are used to store the Write Protection fuses
respectively for each sector of the XFLASH Module (see X) and IFLASH module (see I). The
other three Registers (FNVAPR0 and FNVAPR1L/H) are used to store the Access
Protection fuses (common to both Flash modules even though with some limitations).
Flash non volatile write protection X register low
FNVWPXRL (0x0E DFB0)
W2PPR
Table 20.
RW
15
W2P(2:0)
W2PPR
Bit
14
Flash non volatile write protection X register low
13
Write Protection Bank 2 sectors 2-0 (XFLASH)
These bits, if programmed at 0, disable any write access to the sectors of Bank 2
(XFLASH).
Write Protection Bank 2 Non Volatile cells
This bit, if programmed at 0, disables any write access to the Non Volatile cells of Bank
2. Since these Non Volatile cells are dedicated to Protection registers, once W2PPR
bit is set, the configuration of protection setting is frozen, and can only be modified
executing a Temporary Write Unprotection operation.
12
11
10
reserved
9
NVR
8
Function
7
6
5
4
3
Delivery value: FFFFh
W2P2W2P1W2P0
RW
2
ST10F276Z5
RW
1
RW
0
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