AT89C51AC3 Atmel Corporation, AT89C51AC3 Datasheet - Page 2

• Manufacturer Part Number: AT89C51AC3
• Manufacturer: Atmel Corporation

Specifications of AT89C51AC3

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 2.25
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

Functional
Description
In-System
Programming
Capability
In-Application
Programming or
Self- Programming
Capability
Block Diagram
2
AT89C51AC3 UART Bootloader
The AT89C51AC3 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 UART bootloader can manage a communication with a host through the serial network. 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 application 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. The figure below shows the on-chip
bootloader and IAP processes.
Figure 1. Bootloader Process Description
External host via the
UART Protocol
Communication
ISP Communication
Management
Flash Memory
Management
Flash
Memory
User Call
Management
IAP
Application
4386B–8051–03/08
On chip
User