ST10F269-T3 Datasheet

IC型号：
ST10F269-T3
PDF描述：
16-BIT MCU WITH MAC UNIT, 256K BYTE FLASH MEMORY AND 12K BYT...
文件大小：
1513.42KB
PDF页数：
160页
芯片厂家：
STMICROELECTRONICS

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ST10F269-T3

5.6 - Bootstrap Loader

The built-in bootstrap loader (BSL) of the

ST10F269-T3 provides a mechanism to load the

startup program through the serial interface after

reset. In this case, no external memory or internal

Flash memory is required for the initialization

code starting at location 00鈥?000h (see Figure 5).

The bootstrap loader moves code/data into the

internal RAM, but can also transfer data via the

serial interface into an external RAM using a

second level loader routine. Flash Memory

(internal or external) is not necessary, but it may

be used to provide lookup tables or 鈥渃ore-code鈥?/div>

like a set of general purpose subroutines for I/O

operations,

number

crunching,

system

initialization, etc.

The bootstrap loader can be used to load the

complete application software into ROMless

systems, to load temporary software into

complete systems for testing or calibration, or to

load a programming routine for Flash devices.

The BSL mechanism can be used for standard

system startup as well as for special occasions

like system maintenance (firmer update) or

end-of-line programming or testing.

Figure 5 :

Bootstrap Loader Sequence

RSTIN

5.6.1 - Entering the Bootstrap Loader

The ST10F269-T3 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 ST10F269-T3 scans the RXD0

line to receive a zero Byte, one start bit, eight 鈥?鈥?/div>

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. The identification byte is D5h for

ST10F269-T3.

P0L.4

RxD0

TxD0

CSP:IP

1) BSL initialization time

2) Zero Byte (1 start bit, eight 鈥?鈥?data bits, 1 stop bit), sent by host.

3) Identification Byte (D5h), sent by ST10F269-T3.

4) 32 Bytes of code / data, sent by host.

5) Caution: TxD0 is only driven a certain time after reception of the zero Byte.

6) Internal Boot ROM.

30/160

000000000 00000000000000000000000000000000000000000000000000000000000000000000

000

Internal Boot Memory (BSL) routine

32 Byte user software

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