AT89C51ED2-RLRUM Atmel, AT89C51ED2-RLRUM Datasheet - Page 101

• Manufacturer Part Number: AT89C51ED2-RLRUM
• Description: IC MCU FLASH 8051 64K 5V 44-VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51ED2-RLRUM

• 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: 44-TQFP, 44-VQFP
• Core: 8051
• Processor Series: AT89x
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 60 MHz
• Data Ram Size: 2 KB
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Mounting Style: SMD/SMT
• Interface Type: UART, SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details

24.6.5
Figure 24-5. Bootloader Process
4235K–8051–05/08
Boot Process
PC = 0000h
User Application
BLJB = 1
ENBOOT = 0
USER BOOT LOADER
PC= [SBV]00h
BSB = 00h
SBV = FCh
Condition?
Hardware
BLJB!= 0
RESET
?
?
?
If BLJB = 0 then ENBOOT Bit (AUXR1) is Set
BLJB = 0
ENBOOT = 1
Yes (PSEN = 0, EA = 1, and ALE =1 or Not Connected)
else ENBOOT Bit (AUXR1) is Cleared
Atmel BOOT LOADER
AT89C51RD2/ED2
101