AT89C51AC2 Atmel Corporation, AT89C51AC2 Datasheet - Page 2

• Manufacturer Part Number: AT89C51AC2
• Manufacturer: Atmel Corporation

Specifications of AT89C51AC2

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 40 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 1.25
• 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
A/T89C51AC2 UART Bootloader
The A/T89C51AC2 Bootloader facilitates In-System Programming and In-Application
Programming.
In-System Programming (ISP) allows the user to program or reprogram a microcontroller’s on-
chip Flash memory without removing it from the system and without the need of a pre-pro-
grammed 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 the 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
Communication
UART Protocol
ISP Communication
Management
Flash Memory
Management
Memory
Flash
Management
User Call
IAP
Application
On-chip
4231D–CAN–03/08
User