AT89C5131A View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A

USB Microcontrollers

Atmel Corporation 

AT89C5131A USB Bootloader

Figure 4. Low-pin Count Regular Boot Process

RESET

Bit ENBOOT in AUXR1 Register is

Initialized with BLJB Inverted

ENBOOT = 0

PC = 0000h Yes

BLJB = 1

No

ENBOOT = 1

PC = F400h

No

Yes

P1_CF = FFh

No

P1_CF = P1

No

Yes

P3_CF = FFh

Yes No

P3_CF = P3

No

Yes

P4_CF = FFh

Yes

No

P4_CF = P4

Yes

BSB = 0

Yes

No

No

SBV < 7Fh

Yes

Start Application

Start User Bootloader

Start Bootloader

9

4287E–USB–04/08

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