T89C51AC2-SLSIM datasheet(49/121 Pages) ATMEL

49 / 121 page

A/T89C51AC2

4127G–8051–05/06

Figure 26. Hardware Boot Process Algorithm

Application

Programming Interface

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

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

by functions.

All of these APIs are described in detail in the following documents on the Atmel web

site.

•

Datasheet Bootloader UART A/T89C51AC2

XROW Bytes

Table 32. XROW Mapping

RESET

Hardware

condition?

BLJB = = 0

bit ENBOOT in AUXR1 register

is initialized with BLJB inverted.

ENBOOT = 1

PC = F800h

ENBOOT = 1

PC = F800h

FCON = 00h

FCON = F0h

Boot Loader

in FM1

ENBOOT = 0

PC = 0000h

Yes

Application

in FM0

(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

F7h

60h

Copy of the Device ID#3: Name and Revision

FFh

61h

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