AT89C51SND1_06 ATMEL [ATMEL Corporation], AT89C51SND1_06 Datasheet - Page 2

• Manufacturer Part Number: AT89C51SND1_06
• Description: USB Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

Functional
Description
In-System
Programming
Capability
In-Application
Programming or
Self- Programming
Capability
Block Diagram
2
AT89C51SND1
The AT89C51SND1 USB Bootloader facilitates In-System Programming (ISP) and In-Applica-
tion Programming.
In-System Programming allows the user to program or reprogram the 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.
IAP allows the reprogramming of the microcontroller on-chip Flash memory without removing it
from the system and while the embedded application is running.
The USB bootloader contains some Application Programming Interface routines named API rou-
tines allowing IAP by using the user’s firmware.
This section describes the different parts of the USB 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
Flash
Memory
Management
User Call
IAP
Application
On-chip
4254C–MP3–03/06
User