ST10F280_12 datasheet(47/239 Pages) STMICROELECTRONICS

No de pièce	ST10F280

Description	16-bit MCU with MAC unit, 512 Kbyte Flash memory and 18 Kbyte RAM

PDF	239 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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47 / 239 page

ST10F280

Internal Flash memory

Doc ID 8673 Rev. 3

47/239

5.6.1

Entering the bootstrap loader

The ST10F280 enters BSL mode when 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 Boot-ROM. No part of the standard mask

Memory or Flash Memory area is required for this.

After entering BSL mode and the respective initialization the ST10F280 scans the RxD0 line

to receive a zero Byte, one start Bit, eight ‘0’ data Bits and one stop Bit.

From the duration of this zero Byte it calculates the corresponding Baud rate factor with

respect to the current CPU clock, initializes the serial interface ASC0 accordingly and

switches pin TXD0 to output.

Using this Baud rate, an identification Byte is returned to the host that provides the loaded

data.

This identification Byte identifies the device to be booted. Identification byte is D5h for the

ST10F280.

Figure 5.

Bootstrap loader sequence

ST10F280 Fiches technique(PDF) 47 Page - STMicroelectronics