ST10F296 datasheet(79/346 Pages) STMICROELECTRONICS

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ST10F296E

The bootstrap loader

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6.4.2

Entering the CAN bootstrap loader

The ST10F296E enters BSL mode, if pin P0L.4 is sampled low at the end of a hardware

reset. In this case, the built-in bootstrap loader is activated independent of the selected bus

mode. The bootstrap loader code is stored in a special Test-Flash, no part of the standard

mask ROM or Flash memory area is required for this.

After entering BSL mode and the respective initialization the ST10F296E scans the

CAN1_TxD line to receive the following initialization frame:

●

Standard identifier = 0h

●

DLC = 0h

As all the bits to be transmitted are dominant bits, a succession of five dominant bits and

one stuff bit on the CAN network is used. From the duration of this frame it calculates the

corresponding baud rate factor with respect to the current CPU clock, initializes the CAN1

interface accordingly, switches pin CAN1_TxD to output and enables the CAN1 interface to

take part in the network communication. Using this baud rate, a message object is

configured to send an acknowledge frame. The ST10F296E does send this message object,

but, the host can request it by sending remote frame.

The acknowledge frame is the following for the ST10F296E:

●

Standard identifier = E6h

●

DLC = 3h

●

Data0 = D5h (generic acknowledge of the ST10 devices)

●

Data1 = IDCHIP least significant byte

●

Data2 = IDCHIP most significant byte

For the ST10F296E, IDCHIP = 128Xh.

Note:

Two behaviors can be distinguished regarding acknowledgement of the ST10 by the host. If

the host is behaving according to CAN protocol, as long as the ST10 CAN module is not

configured, the host is alone on the CAN network and does not receive acknowledgement. It

automatically resends the zero frame. As soon as the ST10 CAN is configured, the host

acknowledges the zero frame. The ‘acknowledge frame’, with identifier 0xE6, is configured,

but, the transmit request is not set. The host can request this frame to be sent, and therefore

get the IDCHIP, by sending a remote frame.

As the IDCHIP is sent in the acknowledge frame, Flash programming software now has the

possibility to know immediately the exact type of device to be programmed.

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ST10F296 数据表(PDF) 79 Page - STMicroelectronics

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