ST10F271 datasheet(43/173 Pages) STMICROELECTRONICS

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ST10F271

Bootstrap loader

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Bootstrap loader

ST10F271 implements Boot capabilities in order to:

●

Support bootstrap via UART or bootstrap via CAN for the standard bootstrap.

●

Support a Selective Bootstrap Loader, to manage the bootstrap sequence in a different

way.

6.1

Selection among user-code, standard or selective bootstrap

The boot modes are triggered with a special combination set on Port0L[5...4]. Those

signals, as other configuration signals, are latched on the rising edge of RSTIN pin.

●

Decoding of reset configuration (P0L.5 = 1, P0L.4 = 1) will select the normal mode

(also called User Mode) and select the user Flash to be mapped from address

00’0000h.

●

Decoding of reset configuration (P0L.5 = 1, P0L.4 = 0) will select ST10 standard

bootstrap mode (Test-Flash is active and overlaps user Flash for code fetches from

address 00'0000h; user Flash is active and available for read accesses).

●

Decoding of reset configuration (P0L.5 = 0, P0L.4 = 1) will activate new verifications to

select which bootstrap software to execute:

–

if the User mode signature in the User Flash is programmed correctly, then a

software reset sequence is selected and the User code is executed;

–

if the User mode signature is not programmed correctly in the user Flash, then the

User key location is read again. Its value will determine which communication

channel will be enabled for bootstraping

6.2

Standard bootstrap loader

After entering the standard BSL mode and the respective initialization, the ST10F271 scans

the RxD0 line and the CAN1_RxD line to receive either a valid dominant bit from CAN

interface, or a start condition from UART line.

Start condition on UART RxD: ST10F271 starts standard bootstrap loader. This bootstrap

loader is identical to other ST10 devices (example: ST10F269, ST10F168).

Valid dominant bit on CAN1 RxD: ST10F271 start bootstrapping via CAN1.

Table 25.

ST10F271 boot mode selection

P0.5

P0.4

ST10 decoding

User Mode: user Flash mapped at 00’0000h

Standard Bootstrap Loader: User Flash mapped from 00’0000h, code fetches

redirected to Test-Flash at 00’0000h

Selective Boot Mode: User Flash mapped from 00’0000h, code fetches

redirected to Test-Flash at 00’0000h (different sequence execution in respect of

Standard Bootstrap Loader)

Reserved

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