ST10F296 datasheet(88/346 Pages) STMICROELECTRONICS

88 / 346 page

Obsolete

Product(s)

- Obsolete

Product(s)

The bootstrap loader

ST10F296E

88/346

6.6.5

Watchdog

The watchdog timer remains disabled during both standard and alternate boot mode. If a

watchdog reset occurs, a software reset is generated.

Note:

See note concerning software reset in Section 6.2.7 on page 73.

6.6.6

Exiting alternate boot mode

Once the ABM mode is entered, it can be exited only with a software or hardware reset.

Note:

See note concerning software reset in Section 6.2.7 on page 73.

6.6.7

Alternate boot user software

Users can write the software they want to execute in alternate boot user mode if the rules

concerning the following items are met:

●

Mapping variables

●

Disabling interrupts

●

Exiting conditions

●

Predefining vectors in Block 0 of Bank 2

●

Using the watchdog

The starting address is 09’0000h.

6.6.8

User/alternate boot mode signature check

To operate user/alternate boot mode, the signature of two memory location contents are

calculated and compared to a reference signature. Flash memory locations must be

reserved and programmed as follows:

User mode signature

00'0000h: Memory address of operand0 for the signature computing

00’1FFCh: Memory address of operand1 for the signature computing

00’1FFEh: Memory address for the signature reference

Alternate mode signature

09'0000h: Memory address of operand0 for the signature computing

09’1FFCh: Memory address of operand1 for the signature computing

09’1FFEh: Memory address for the signature reference

Correct values for operand0, operand1 and the reference signature allow the sequence in

Figure 14 to execute successfully.

Figure 14.

Reference signature computation

MOV

Rx, CheckBlock1Addr

; 00’0000h for standard reset

ADD

Rx, CheckBlock2Addr

; 00’1FFCh for standard reset

CPLB

RLx

; 1s complement of the lower

;byte of the sum

CMP

Rx, CheckBlock3Addr

; 00’1FFEh for standard reset

Obsolete

Product(s)

- Obsolete

Product(s)

ST10F296 Fiches technique(PDF) 88 Page - STMicroelectronics

ST10F296 Fiches technique(HTML) 88 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