PSD914F3-90 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
PSD914F3-90 Datasheet PDF : 93 Pages
| |||
Preliminary Information
PSD4000 Series
The
PSD4000
Functional
Blocks
(cont.)
Table 10. Sector Protection/Security Bit Definition
Flash Protection Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Sec7_Prot Sec6_Prot Sec5_Prot Sec4_Prot Sec3_Prot Sec2_Prot Sec1_Prot Sec0_Prot
Bit Definitions:
Sec<i>_Prot 1 = Main Flash Sector <i> is write protected.
Sec<i>_Prot 0 = Main Flash Sector <i> is not write protected.
Flash Boot Protection Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Security_
Bit
*
*
*
Sec3_Prot Sec2_Prot Sec1_Prot Sec0_Prot
*: Not used.
Bit Definitions:
Sec<i>_Prot 1 = Flash Boot Sector <i> is write protected.
Sec<i>_Prot 0 = Flash Boot Sector <i> is not write protected.
Security_Bit 0 = Security Bit in device has not been set.
1 = Security Bit in device has been set.
9.1.1.9.2 Reset Instruction
The Reset instruction consists of one write cycle (see Table 8). It can also be optionally
preceded by the standard two write decoding cycles (writing AAh to AAAh and 55h to
554h).
The Reset instruction must be executed after:
1. Reading the Flash Protection status or Flash ID using the Flash instruction.
2. When an error condition occurs (DQ5 (DQ13) goes high) during a Flash programming
or erase cycle.
The Reset instruction will reset the Flash to normal Read Mode immediately. However, if
there is an error condition (DQ5 (DQ13) goes high), the Flash memory will return to the
Read Mode in 25 µSeconds after the Reset instruction is issued.
The Reset instruction is ignored when it is issued during a Flash programming or Bulk
Erase cycle. The Reset instruction will abort the on going sector erase cycle and return the
Flash memory to normal Read Mode in 25 µSeconds.
9.1.1.9.3 Reset Pin Input
The reset pulse input from the pin will abort any operation in progress and reset the Flash
memory to Read Mode. When the reset occurs during a programming or erase cycle, the
Flash memory will take up to 25 µSeconds to return to Read Mode. It is recommended that
the reset pulse (except power on reset, see Reset Section) be at least 25 µSeconds such
that the Flash memory will always be ready for the MCU to fetch the boot code after reset
is over.
25
Share Link: 