ST10F296 datasheet(70/346 Pages) STMICROELECTRONICS

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The bootstrap loader

ST10F296E

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6.2.3

Booting steps

There are four steps to booting the ST10F296E with the boot loader code (see Figure 7):

The ST10F296E is reset with P0L.4 low

The internal new bootstrap code runs on the ST10 and a first level user code is

downloaded from the external device, via the selected serial link (UART0 or CAN1).

The bootstrap code is contained in the ST10F296E Test-Flash and is automatically run

when ST10F296E is reset with P0L.4 low. After loading a preselected number of bytes,

ST10F296E begins executing the downloaded program.

The first level user code is run on ST10F296E. Typically, this user code is another

loader that is used to download the application software into the ST10F296E.

The loaded application software is now running

Figure 7.

Booting steps for the ST10F296E

6.2.4

Hardware to activate BSL

The hardware that activates the BSL during every hardware reset may be a simple pull-

down resistor on P0L.4. switchable solution (via jumper or an external signal) may be used

for systems that only temporarily use the BSL.

Note:

The CAN alternate function on Port 4 lines is not activated if the user has selected eight

address segments (Port 4 pins have three functions: I/O port, address-segment, and CAN).

Bootstrapping via CAN requires that four address segments or less are selected.

External device

Run Bootstrap Code

Run 1st level Code

Run Application Code

Step1

Step2

Step3

Step4

Download

1st level user code

Download

Application

Entering bootstrap

Loading 1st level user code

Loading the application

and exiting BSL

ST10F296

from Test-Flash

from DPRAM @FA40h

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