F272-BAR-P View Datasheet(PDF) - STMicroelectronics

Part Name

Description

View to exact match

F272-BAR-P

16-bit MCU with 256 Kbyte Flash memory and 12/20 Kbyte RAM

STMicroelectronics 

ST10F272B/ST10F272E

Bootstrap loader

6.3

6.3.1

6.3.2

6.3.3

Alternate and selective boot mode (ABM and SBM)

Activation of the ABM and SBM

Alternate boot is activated with the combination ‘01’ on Port0L[5..4] at the rising edge of

RSTIN.

User mode signature integrity check

The behavior of the Selective Boot Mode is based on the computing of a signature between

the content of 2 memory locations and a comparison with a reference signature. This

requires that users who use Selective Boot have reserved and programmed the Flash

memory locations.

Selective boot mode

When the user signature is not correct, instead of executing the Standard Bootstrap Loader

(triggered by P0L.4 low at reset), additional check is made.

Depending on the value at the User key location, following behavior will occur:

● A jump is performed to the Standard Bootstrap Loader

● Only UART is enabled for bootstraping

● Only CAN1 is enabled for bootstraping

● The device enters an infinite loop.

Doc ID 11917 Rev 3

49/188

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