AT89C5131A View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A

USB Microcontrollers

Atmel Corporation 

• Port3

• Port4 (only bit0 and bit1)

The Hardware Condition configuration are stored in three bytes called P1_CF, P3_CF, P4_CF.

These bytes can be modified by the user through a set of API or through an ISP command.

There is a priority between P1_CF, P3_CF and P4_CF (see Figure 4 on page 9).

Note:

The BLJB must be at 0 (programmed) to be able to restart the bootloader.

If the BLJB is equal to 1 (unprogrammed) only the hardware parallel programmer can change this

bit (see AT89C5131A datasheet for more details).

6 AT89C5131A USB Bootloader

4287E–USB–04/08

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