at89c51snd1 ATMEL Corporation, at89c51snd1 Datasheet - Page 2

• Manufacturer Part Number: at89c51snd1
• Description: Mp3 Microcontrollers
• Manufacturer: ATMEL Corporation

Functional
Description
In-System Programming
Capability
In-Application
Programming or Self-
Programming Capability
Block Diagram
2
AT89C51SND1 UART Bootloader
The AT89C51SND1 bootloader facilitates In-System Programming and In-Application
Programming.
In-System Programming (ISP) allows the user to program or reprogram a microcontrol-
ler’s on-chip Flash memory without removing it from the system and without the need of
a pre-programmed application.
The UART bootloader can manage a communication with a host through the serial net-
work. It can also access and perform requested operations on the on-chip Flash
memory.
In-Application Programming (IAP) allows the reprogramming of a microcontroller’s on-
chip Flash memory without removing it from the system and while the embedded appli-
cation is running.
The UART bootloader contains some Application Programming Interface routines
named API routines allowing 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
UART Protocol
ISP Communication
Management
Flash memory
Management
Memory
Flash
Management
User Call
IAP
Application
On-chip
User
4241B–MP3–07/04