ST10F296 datasheet(85/346 Pages) STMICROELECTRONICS

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ST10F296E

The bootstrap loader

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6.4.7

Bootstrap via CAN

After the bootstrap phase, the ST10F296E CAN module is configured as follows:

●

Pin P4.6 is configured as output (the latch value is: 1 = recessive) to assume

CAN1_TxD function.

●

The MO2 is configured to output the acknowledge of the bootstrap with the standard

identifier E6h, DLC = 3, Data0 = D5h, and Data1&2 = IDCHIP.

●

The MO1 is configured to receive messages with the standard identifier 5h. Its

acceptance mask is set in order that all bits must match. The DLC received is not

checked: The ST10 expects only 1 byte of data at a time.

No other message is sent by the ST10F296E after the acknowledge.

Note:

The CAN bootstrap loader waits for 128 bytes of data instead of 32 bytes (see Section 6.3:

Standard bootstrap with UART (RS232 or K-line) on page 73). This is to allow the user to

reconfigure the CAN bit rate as soon as possible.

6.5

Comparing the old and the new bootstrap loader

Table 40 and Table 41 summarize the differences between bootstrapping via UART only (old

ST10 method) and bootstrapping via UART or CAN (new ST10F296E method).

6.5.1

Software aspects

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

the XPEN bit of the SYSCON register is set. This is done as follows:

●

Disable the XPeripherals by clearing the XPEN bit in the SYSCON register.

Caution: This part of code must not be located in the XRAM, because if so, it is

disabled.

●

Enable the XPeripherals that are needed by writing the correct value in the XPERCON

●

Set the XPEN bit in the SYSCON.

Note:

The settings can be modified if the EINIT instruction is not executed (and is not in the

bootstrap loader code).

Table 40.

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 bootstrapping

via UART and bootstrapping via CAN1,

avoid loading the application software in

the 00’FA60h/00’FABFh range

Loads 32 bytes from the

UART

Loads 32 bytes from UART

(bootstrapping via UART

mode)

Same files can be used for bootstrapping

via UART

User selected XPeripherals

can be enabled during

bootstrapping (see steps 3

and 4 of Section 6.2.3:

Booting steps on page 70)

XPeripherals selection is

fixed.

User can change the XPeripheral

selections through a specific code

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