ST10F276E datasheet(67/235 Pages) STMICROELECTRONICS

67 / 235 page

ST10F276E

Bootstrap loader

Doc ID 12303 Rev 3

67/235

5.6

Alternate boot mode (ABM)

5.6.1

Activation

Alternate boot is activated with the combination ‘01’ on Port0L[5..4] at the rising edge of

RSTIN.

5.6.2

Memory mapping

The ST10F276E has the same memory mapping for standard boot mode and for alternate

boot mode:

●

Test-Flash: Mapped from 00’0000h. The Standard Bootstrap Loader can be started by

executing a jump to the address of this routine (JMPS 00’xxxx; address to be defined).

●

User Flash: The User Flash is divided in two parts: The IFLASH, visible only for

memory reads and memory writes (no code fetch) and the XFLASH, visible for any

ST10 access (memory read, memory write and code fetch).

●

All ST10F276E XRAM and Xperipherals modules can be accessed if enabled in

XPERCON register.

Note:

The alternate boot mode can be used to reprogram the whole content of the ST10F276E

User Flash (except Block 0 in Bank 2, where the alternate boot is mapped into).

5.6.3

Interrupts

The ST10 interrupt vector table is always mapped from address 00’0000h.

As a consequence, interrupts are not allowed in Alternate Boot Mode; all maskable and non-

maskable interrupts must be disabled.

5.6.4

ST10 configuration in alternate boot mode

When the ST10F276E enters BSL mode via CAN, the configuration shown in Table 35 is

automatically set (values that deviate from the normal reset values are marked in bold).

Table 35.

ST10 configuration in alternate boot mode

Function or register

Access

Notes

Watchdog timer

Disabled

0404H(1)

In Bootstrap modes (standard or alternate) ROMEN, bit 10 of SYSCON, is always set regardless of EA pin

level. BYTDIS, bit 9 of SYSCON, is set according to data bus width selection via Port0 configuration.

XPEN bit set

Context pointer CP

FA00H

Stack pointer SP

FA40H

FC00H

acc. to startup config.(2)

BUSCON0 is initialized with 0000h, external bus disabled, if pin EA is high during reset. If pin EA is low

during reset, BUSACT0, bit 10, and ALECTL0, bit 9, are set enabling the external bus with lengthened ALE

signal. BTYP field, bit 7 and 6, is set according to Port0 configuration.

XPERCON

002DH

XRAM1-2, XFlash, CAN1 enabled

ST10F276E датащи(PDF) 67 Page - STMicroelectronics

ST10F276E датащи(HTML) 67 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

датащи скачать

ссылки URL