ST10F280_12 datasheet(38/239 Pages) STMICROELECTRONICS

38 / 239 page

Internal Flash memory

ST10F280

38/239

Doc ID 8673 Rev. 3

period, it will terminate the time-out period in addition to erase Suspend. The Toggle Bit

FSB.6, when monitored at an address that belongs to the block being erased, stops toggling

when Erase Suspend Command is effective, It happens between 0.1

μs and 15μs after the

Erase Suspend Command has been written. The Flash will then go in normal Read Mode,

and read from blocks not being erased is valid, while read from block being erased will

output FSB.2 toggling. During a Suspend phase the only instructions valid are Erase

Resume and Program Word. A Read / Reset instruction during Erase suspend will definitely

abort the Erase and result in invalid data in the block being erased.

Erase Resume (ER). This instruction can be given when the memory is in Erase Suspend

State. Erase can be resumed by writing the command xx30h at any address without any Cl-

enable sequence.

Program during Erase Suspend. The Program Word instruction during Erase Suspend is

allowed only on blocks that are not Erase-suspended. This instruction is the same than the

Program Word instruction.

Set Protection (SP). This instruction can be used to enable both Block Protection (to

protect each block independently from accidental Erasing-Programming Operation) and

Code Protection (to avoid code dump). The Set Protection Command must be given after a

special CI-Protection Enable cycles (see instruction table). The following Write cycle, will

program the Protection Register. To protect the block x (x = 0 to 10), the data bit x must be at

‘0’. To protect the code, bit 15 of the data must be ‘0’. Enabling Block or Code Protection is

permanent and can be cleared only by STM. Block Temporary Unprotection and Code

Temporary Unprotection instructions are available to allow the customer to update the code.

Note:

The new value programmed in protection register will only become active after a reset.

Bit that are already at ’0’ in protection register must be confirmed at ’0’ also in data latched

during the 4th cycle of set protection command, otherwise an error may occur.

Read Protection Status (RP). This instruction is used to read the Block Protection status

and the Code Protection status. To read the protection register (see Table 3), the CI-

Protection Enable cycles must be executed followed by the command xx90h at address

x2A54h. The following Read Cycles at any odd word address will output the Block

Protection Status. The Read/Reset command xxF0h must be written to reset the protection

interface.

Note:

After a modification of protection register (using Set Protection command), the Read

Protection Status will return the new PR value only after a reset.

Block Temporary Unprotection (BTU). This Instruction can be used to temporary

unprotect all the blocks from Program / Erase protection. The Unprotection is disabled after

a Reset cycle. The Block Temporary Unprotection command xxC1h must be given to enable

Block Temporary Unprotection. The Command must be preceded by the CI-Protection

Enable cycles and followed by the Read/Reset command xxF0h.

Set Code Protection (SCP). This kind of protection allows the customer to protect the

proprietary code written in Flash. If installed and active, Flash Code Protection prevents

data operand accesses and program branches into the on-chip Flash area from any location

outside the Flash memory itself. Data operand accesses and branches to Flash locations

are only and exclusively allowed for instructions executed from the Flash memory itself.

Every read or jump to Flash performed from another memory (like internal RAM, external

memory) while Code Protection is enabled, will give the opcode 009Bh related to TRAP #00

illegal instruction. The CI-Protection Enable cycles must be sent to set the Code Protection.

By writing data 7FFFh at any odd word address, the Code Protected status is stored in the

Flash Protection Register (PR). Protection is permanent and cannot be cleared by the user.

ST10F280 Fiches technique(PDF) 38 Page - STMicroelectronics

ST10F280 Fiches technique(HTML) 38 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Fiches technique Télécharger

Lien URL