ST10F276 datasheet(65/229 Pages) STMICROELECTRONICS

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ST10F276

Bootstrap loader

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5.5.2

Hardware aspects

Although the new bootstrap loader is designed to be compatible with the old bootstrap

loader, there are a few hardware requirements for the new bootstrap loader as summarized

in Table 34.

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 ST10F276 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 ST10F276 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 ST10F276

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

nonmaskable interrupts must be disabled.

Table 34.

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, but only as CAN1_RxD

or input or address segments.

Level on CAN1_RxD can

change during boot Step 2.

Level on CAN1_RxD must be stable

at ‘1’ during boot Step 2.

External pull-up on P4.5

needed.

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