ST10F296 datasheet(78/346 Pages) STMICROELECTRONICS

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The bootstrap loader

ST10F296E

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6.4

Standard bootstrap with CAN

6.4.1

Features

The bootstrap via CAN has the same overall behavior as the bootstrap via UART:

●

Same bootstrapping steps

●

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

acknowledge frame (on request only), load a fixed number of bytes and then run.

●

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

Figure 12.

CAN bootstrap loader sequence

BSL initialization time > 1ms @ fCPU = 40 MHz

Zero frame (CAN message: standard ID = 0, DLC = 0) sent by host

CAN message (standard ID = E6h, DLC = 3, Data0 = D5h, Data1-Data2 = IDCHIP_low-high) sent by

ST10F296E on request.

128 bytes of code/data, sent by host

CAN1_TxD is only driven a certain time after reception of the zero byte (1.3 ms @ fCPU = 40 MHz).

Internal boot ROM/Test-Flash

The bootstrap loader may be used to load the complete application software into ROM-less

systems. It may also load temporary software into complete systems for testing or

calibration. In addition, it may be used to load a programming routine for Flash devices.

The BSL mechanism may be used for standard system start-ups as well as for special

occasions like system maintenance (firmware update), end-of-line programming or testing.

RSTIN

CAN1_TxD

Int. boot ROM / Test-Flash BSL-routine

128 bytes

CAN1_RxD

CSP:IP

user software

P0L.4

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