ST10F296E datasheet(73/346 Pages) STMICROELECTRONICS

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ST10F296E

The bootstrap loader

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6.2.7

Exiting bootstrap loader mode

To execute a program in normal mode, the BSL mode must first be terminated. The

ST10F296E exits BSL mode upon a software reset (level on P0L.4 is ignored) or a hardware

reset (P0L.4 must be high in this case). After the reset, the ST10F296E starts executing

from location 00’0000H of the internal Flash (user Flash) or the external memory, as

programmed via pin EA.

Note:

If a bidirectional software reset is executed, and external memory boot is selected (EA = 0),

a degeneration of the software reset event into a hardware reset can occur. This implies that

P0L.4 becomes transparent, so to exit from bootstrap mode it is necessary to release pin

P0L.4 (it is no longer ignored).

6.2.8

Hardware requirements

Although the new bootstrap loader has been designed to be compatible with the old one,

there are a few hardware requirements related to the new one:

●

External bus configuration: Four segment address lines or less (keep CAN I/O’s

available) are required.

●

Use of CAN pins (P4.5 and P4.6): P4.5 (CAN1_RxD) can only be used as a port input.

Pin P4.6 (CAN1_TxD) can be used as input or output.

●

Level on UART RxD and CAN1_RxD during the bootstrap phase (see step 2 of

Figure 7: Booting steps for the ST10F296E on page 70): Must be 1 (external pull-up’s

recommended).

6.3

Standard bootstrap with UART (RS232 or K-line)

6.3.1

Features

ST10F296E bootstrap via UART has the same overall behavior as the old ST10 bootstrap

via UART:

●

Same bootstrapping steps

●

Same bootstrap method: To analyze the timing of a predefined byte, send back an

acknowledge byte, load a fixed number of bytes and then run.

●

Same functionalities: To boot with different crystals and PLL ratios.

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