AT89C51ED2-3CSUM Atmel, AT89C51ED2-3CSUM Datasheet - Page 99

• Manufacturer Part Number: AT89C51ED2-3CSUM
• Description: IC 8051 MCU FLASH 64K 40DIP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51ED2-3CSUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -

24.6.3
4235K–8051–05/08
Functional Description
Specific Protocol
External Host with
Communication
Figure 24-3. Bootloader Functional Description
On the above diagram, the on-chip bootloader processes are:
The purpose of this process is to manage the communication and its protocol between the on-
chip bootloader and a external device. The on-chip ROM implements a serial protocol (see sec-
tion “Bootloader Protocol”). This process translate serial communication frame (UART) into
Flash memory access (read, write, erase, etc.).
Several Application Program Interface (API) calls are available for use by an application pro-
gram to permit selective erasing and programming of Flash pages. All calls are made through a
common interface (API calls), included in the ROM bootloader. The programming functions are
selected by setting up the microcontroller’s registers before making a call to a common entry
point (0xFFF0). Results are returned in the registers. The purpose on this process is to translate
the registers values into internal Flash Memory Management.
This process manages low level access to Flash memory (performs read and write access).
• ISP Communication Management
• User Call Management
• Flash Memory Management
ISP Communication
Management
Flash Memory
Management
Memory
Flash
Management (API)
User Call
AT89C51RD2/ED2
Application
User
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