ST10F273Z4 STMicroelectronics, ST10F273Z4 Datasheet - Page 38

• Manufacturer Part Number: ST10F273Z4
• Description: 16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
• Manufacturer: STMicroelectronics

Specifications of ST10F273Z4

• Single Voltage Supply: 5 V ±10%

Internal Flash memory
5.5.5
Table 23.
5.5.6
Table 24.
5.5.7
38/188
PEN15 PEN14 PEN13 PEN12 PEN11 PEN10 PEN9 PEN8 PEN7 PEN6 PEN5 PEN4 PEN3 PEN2 PEN1 PEN0
PDS15 PDS14 PDS13 PDS12 PDS11 PDS10 PDS9 PDS8 PDS7 PDS6 PDS5 PDS4 PDS3 PDS2 PDS1 PDS0
PDS(15:0)
PEN15-0
RW
RW
15
15
Bit
Bit
RW
RW
14
14
Flash non volatile access protection register 1 low
FNVAPR1L (0x0E DFBC)
Flash non volatile access protection register 1 low
Flash non volatile access protection register 1 high
FNVAPR1H (0x0E DFBE)
Flash non volatile access protection register 1 high
Access protection
The I-Flash module has one level of access protection (access to data both in Reading and
Writing): if bit ACCP of FNVAPR0 is programmed at 0, the I-Flash module becomes access
protected: data in the I-Flash module can be read only if the current execution is from the I-
Flash module itself.
Protection can be permanently disabled by programming bit PDS0 of FNVAPR1H, in order
to analyze rejects. Protection can be permanently enabled again by programming bit PEN0
of FNVAPR1L. The action to disable and enable again Access Protections in a permanent
way can be executed a maximum of 16 times.
Trying to write into the access protected Flash from internal RAM or external memories will
be unsuccessful. Trying to read into the access protected Flash from internal RAM or
external memories will output a dummy data (software trap 0x009Bh).
When the Flash module is protected in access, also the data access through PEC of a
peripheral is forbidden. To read/write data in PEC mode from/to a protected bank, first it is
necessary to temporarily unprotect the Flash module.
In the following table a summary of all levels of possible Access protection is reported: in
particular, supposing to enable all possible access protections, when fetching from a
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.
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.
RW
RW
13
13
RW
RW
12
12
RW
RW
11
11
RW
10
RW
10
RW
RW
9
9
RW
RW
8
8
NVR
NVR
Function
Function
RW
RW
7
7
RW
RW
6
6
RW
RW
5
5
RW
RW
4
4
RW
RW
3
3
Delivery value: FFFFh
Delivery value: FFFFh
RW
RW
2
2
ST10F273Z4
RW
RW
1
1
RW
RW
0
0