AT89C5131A-RDTUM datasheet(47/188 Pages) ATMEL

47 / 188 page

4337K–USB–04/08

AT89C5130A/31A-M

Figure 11-2. Hardware Boot Process Algorithm

11.3

Application-Programming-Interface

Several Application Program Interface (API) calls are available for use by an application pro-

gram to permit selective erasing and programming of Flash pages. All calls are made by

functions.

All these APIs are described in detail in the following document on the Atmel web site.

– Datasheet Bootloader USB AT89C5131.

11.4

XROW Bytes

The EXTRA ROW (XROW) includes 128 bytes. Some of these bytes are used for specific pur-

pose in conjonction with the bootloader.

Table 11-1.

XROW Mapping

RESET

BLJB == 0

Bootloader

in FM1

Application

in FM0

bit ENBOOT in AUXR1 Register

Is Initialized with BLJB Inverted.

ENBOOT = 0

PC = 0000h

ENBOOT = 1

PC = F400h

Example, if BLJB=0, ENBOOT

is set (=1) during reset, thus the

bootloader is executed after the

reset.

Description

Default Value

Address

Copy of the Manufacturer Code

58h

30h

Copy of the Device ID#1: Family code

D7h

31h

Copy of the Device ID#2: Memories size and type

BBh

60h

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