PSD813F1 STMICROELECTRONICS [STMicroelectronics], PSD813F1 Datasheet - Page 32

• Manufacturer Part Number: PSD813F1
• Description: Flash In-System Programmable ISP Peripherals For 8-bit MCUs
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

The
PSD813F1
Functional
Blocks
(cont.)
28
PSD813F1-A
Flash Protection Register
PSD/EE Protection Register
9.1.1.8.4 Flash Erase Resume Instruction
If an Erase Suspend instruction was previously executed, the erase operation may be
resumed by this instruction. The Erase Resume instruction consists of writing 030h to any
address while an appropriate Chip Select (FSi) is true. (See Table 9.)
9.1.1.9 Flash and EEPROM Memory Specific Features
9.1.1.9.1 Flash and EEPROM Sector Protect
Each Flash and EEPROM sector can be separately protected against Program and Erase
functions. Sector Protection provides additional data security because it disables all
program or erase operations. This mode can be activated through the JTAG Port or a
Device Programmer.
Sector protection can be selected for each sector using the PSDsoft Configuration program.
This will automatically protect selected sectors when the device is programmed through
the JTAG Port or a Device Programmer. Flash and EEPROM sectors can be
unprotected to allow updating of their contents using the JTAG Port or a Device
Programmer. The microcontroller can read (but cannot change) the sector protection bits.
Any attempt to program or erase a protected Flash or EEPROM sector will be ignored by
the device. The Verify operation will result in a read of the protected data. This allows a
guarantee of the retention of the Protection status.
The sector protection status can be read by the MCU through the Flash protection and
PSD/EE protection registers (CSIOP). See Table 11.
Bit Definitions:
Sec<i>_Prot
Sec<i>_Prot
Table 11. Sector Protection/Security Bit Definition
*:
Bit Definitions:
Sec<i>_Prot
Sec<i>_Prot
Security_Bit
9.1.1.9.2 Reset Instruction
The Reset instruction resets the internal memory logic state machine in a few milliseconds.
Reset is an instruction of either one write operation or three write operations (refer to
Table 9).
Sec7_Prot
Security_
Not used.
Bit 7
Bit 7
Bit
Sec6_Prot Sec5_Prot Sec4_Prot
Bit 6
Bit 6
1 = Flash <i> is write protected.
0 = Flash <i> is not write protected.
1 = EEPROM Boot Sector <i> is write protected.
0 = EEPROM Boot Sector <i> is not write protected.
0 = Security Bit in device has not been set.
1 = Security Bit in device has been set.
*
Bit 5
Bit 5
*
Bit 4
Bit 4
*
Sec3_Prot Sec2_Prot Sec1_Prot Sec0_Prot
Sec3_Prot Sec2_Prot Sec1_Prot Sec0_Prot
Bit 3
Bit 3
Bit 2
Bit 2
Bit 1
Bit 1
Preliminary
Bit 0
Bit 0