ST10F296E datasheet(86/346 Pages) STMICROELECTRONICS

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The bootstrap loader

ST10F296E

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6.5.2

Hardware aspects

The new bootstrap loading method via UART and CAN is compatible with the old method via

UART only. However, some additional hardware is required with the new method which is

summarized in Table 41.

6.6

Alternate boot mode (ABM)

6.6.1

Activation

Alternate boot mode is activated with the combination 01 on Port 0L[5..4] at the rising edge

of RSTIN.

6.6.2

Memory mapping

ST10F296E has the same memory mapping for standard and 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 into 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, code fetch).

●

All ST10F296E XRAM and XPeripheral modules can be accessed if enabled in the

XPERCON register.

Note:

The alternate boot mode can be used to reprogram the whole content of ST10F296E user

Flash (except Block 0 in Bank 2).

6.6.3

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.

Table 41.

Hardware topics summary

Actual bootstrap loader

New bootstrap loader

Comments

P4.5 can be used as output in

BSL mode

P4.5 cannot be used as user output

in BSL mode. It can only be used as

CAN1_RxD, input, or address-

segments.

The level on CAN1_RxD can

change during step 2 of the

booting steps (see

Section 6.2.3 on page 70)

The level on CAN1_RxD must be

stable at 1 during step 2 of the

booting steps (see Section 6.2.3 on

page 70)

External pull-up on P4.5

needed

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