ST10F276Z5 datasheet(65/239 Pages) STMICROELECTRONICS

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ST10F276Z5

Bootstrap loader

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5.5

Comparing the old and the new bootstrap loader

The following tables summarizes the differences between the old ST10 (boot via UART only)

bootstrap and the new one (boot via UART or CAN).

5.5.1

Software aspects

As the CAN1 is needed, XPERCON register is configured by the bootstrap loader code and

bit XPEN of SYSCON is set. However, as long as the EINIT instruction is not executed (and

it is not in the bootstrap loader code), the settings can be modified. To do this, perform the

following steps:

●

DIsable the XPeripherals by clearing XPEN in SYSCON register. Attention: If this part

of the code is located in XRAM, it will be disabled.

●

Enable the needed XPeripherals by writing the correct value in XPERCON register.

●

Set XPEN bit in SYSCON.

Table 34.

Software topics summary

Old bootstrap loader

New bootstrap loader

Comments

Uses only 32 bytes in Dual-

Port RAM from 00’FA40h

Uses up to 128 bytes in

Dual-Port RAM from

00’FA40h

For compatibility between boot via UART

and boot via CAN1, please avoid loading

the application software in the

00’FA60h/00’FABFh range.

Loads 32 bytes from UART

(boot via UART mode)

Same files can be used for boot via

UART.

User selected Xperipherals

can be enabled during boot

(Step 3 or Step 4).

Xperipherals selection is

fixed.

User can change the Xperipherals

selections through a specific code.

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