at89c5131a ATMEL Corporation, at89c5131a Datasheet - Page 2

• Manufacturer Part Number: at89c5131a
• Description: Usb Microcontrollers
• Manufacturer: ATMEL Corporation

Functional
Description
In-System Programming
Capability (IAP)
In-Application
Programming or Self
Programming Capability
(ISP)
Block Diagram
2
AT89C5131A USB Bootloader
The AT89C5131A bootloader facilitates In-System Programming and In-Application
Programming.
In-System Programming allows the user to program or reprogram a microcontroller on-
chip Flash memory without removing it from the system and without the need of a pre-
programmed application.
The USB bootloader can manage a communication with a host through the USB bus. It
can also access and perform requested operations on the on-chip Flash memory.
In-Application Programming (IAP) allows the reprogramming of a microcontroller on-
chip Flash memory without removing it from the system and while the embedded appli-
cation is running.
The USB bootloader contains some Application Programming Interface routines named
API routines that allow IAP by using the user’s firmware.
This section describes the different parts of the bootloader. Figure 1 shows the on-chip
bootloader and IAP processes.
Figure 1. Bootloader Process Description
External Host Via the
Communication
USB Protocol
ISP Communication
Management
Flash Memory
Management
Memory
Flash
Management
User Call
IAP
Application
On-chip
4287C–USB–11/04
User