AT89C5131A(2004) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A
(Rev.:2004)

USB Microcontrollers

Atmel Corporation 

AT89C5131A USB Bootloader

Figure 2. High-pin Count Regular Boot Process

RESET

ENBOOT = 0

PC = 0000h

H a rd w a re

C o n d itio n

No

Yes

BLJB = 1

No

Bit ENBOOT in AUXR1 Register is

Initialized with BLJB inverted

ENBOOT = 1

PC = F400h

Yes

FCON = 00h

ENBOOT = 1

PC = F400h

FCON = 0Fh

Yes

FCON = 00h

No

No

SBV < 7Fh

Yes

Start Application

Start User Bootloader

Start Bootloader

7

4287C–USB–11/04

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