AT89C51RE2-RLTUM Atmel, AT89C51RE2-RLTUM Datasheet - Page 54

• Manufacturer Part Number: AT89C51RE2-RLTUM
• Description: MCU 8051 128K FLASH 44-VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RE2-RLTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K 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
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 34
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89OCD-01
• Minimum Operating Temperature: - 40 C
• Height: 1.45 mm
• Length: 10.1 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 10.1 mm
• For Use With: AT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Bootloader
Description
Entry points
Boot Process
Description
Hardware boot process
request detection
Communication link
detection
54
AT89C51RE2
PSEN=0
Yes
After reset only one bootloader entry point is possible. This entry point stands at address 0x0000
of the boot ROM memory. This entry point executes the boot process of the bootloader.
The bootloader entry point can be selected through two processes:
At reset, if the hardware conditions are applied, the bootloader entry point is accessed and
executed.
At reset, if the hardware conditions are not set and the BRV2-0 is programmed ‘011’, the boot-
loader entry point is accessed and the bootprocess is started.
The boot process consists in three main operations:
•
•
•
The hardware boot process request is detected when the hardware conditions (under reset,
EA=1 and PSEN=0) are received by the processor or when no hardware condition is applied
and the BRV2:0 is configured ‘011’.
Two interfaces are available for ISP:
•
•
RESET
EA=1
The hardware boot process request detection
The communication link detection (Uart or OCD)
The start-up of the bootloader
UART0
OCD UART
Communication link
detector / initialiser
PC = RM0 @0x0000h
Start Bootloader
No
BRV=’011’
Yes
No
BRV=’100’
Yes
No
BRV=’101’
Yes
Start Application
No
BRV=’110’
Yes
7663E–8051–10/08
No