st10f273m STMicroelectronics, st10f273m Datasheet - Page 40

• Manufacturer Part Number: st10f273m
• Description: 16-bit Mcu With 512 Kbyte Flash Memory And 36 Kbyte Ram
• Manufacturer: STMicroelectronics

Internal Flash memory
Note:
5.5.1
Note:
5.5.2
40/182
The protection bits in the Non-Volatile registers are programmable one time and this
programing is permanent. Temporary unprotection will be handled with their Volatile
equivalent.
The protections can be programmed using the Set Protection operation (see
Flash control registers
external memories.
Two kind of protections are available:
●
●
The next sections show the different level of protections and highlight the architecture
limitations.
Protection registers
The five Non-Volatile Protection Registers are one-time programmable for the user.
Two registers, FVWPIRL and FVWPIRH, are used to store the Write Protection fuses for
each sector IFlash module. The other three registers (FNVAPR0 and FNVAPR1L/H) are
used to store the Access Protection fuses.
On-going protection operations are flagged with BSYNVR, bit 1 of FCR0L register.
Flash non-volatile write protection I register low (FNVWPIRL)
FNVWPIRL (0x0E DFB4)
Table 20.
15:12
11:10
15
Bit
9:0
write protections to avoid unwanted writings
access protections to avoid piracy
Reserved
14
W0P11
W0P10
Name
W0P9
W0P0
-
...
FNVWPIRL register bits
-
13
12
Reserved. These bits must be left to their default value ‘1’ when programming
PVWPIRL.
Read-Only for Write protection Bank0 sectors 11 and 10
Write protection bank 0 / sectors 9-0
These bits must be left to their default value ‘1’ when programming FVWPIRL
(they can not be used to set write protection on sectors B0F11 and B0F10).
After a protection command, these bits will reflect the value of bit 0 and 1 of
FVWPIRH register (W0P11 and W0P10).
These bits, if programmed at 0, disable any write access to the sectors of
Bank 0 (IFlash).
description) that must be executed from the on-chip RAMs or from
W0P
RO
11
11
W0P
RO
10
10
W0P
RW
9
9
W0P
RW
8
8
W0P
NVR
RW
7
7
Function
W0P
RW
6
6
W0P
RW
5
5
W0P
RW
4
4
W0P
RW
3
3
Delivery value: FFFFh
W0P
RW
2
2
Section 5.4:
ST10F273M
W0P
RW
1
1
W0P
RW
0
0