AT89C51RB2-RLTUM Atmel, AT89C51RB2-RLTUM Datasheet - Page 79

• Manufacturer Part Number: AT89C51RB2-RLTUM
• Description: IC 8051 MCU FLASH 16K 44VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RB2-RLTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.25K 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
• Cpu Family: 89C
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 60MHz
• Interface Type: SPI/UART
• Total Internal Ram Size: 1.25KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: VQFP
• Package: 44VQFP
• Family Name: 89C
• Maximum Speed: 60 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Processor Series: AT89x
• Core: 8051
• Data Ram Size: 1.25 KB
• Maximum Clock Frequency: 60 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• For Use With: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCUAT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Compliant

ONCE
Chip Emulation)
4180E–8051–10/06
™
Mode (ON
The ONCE mode facilitates testing and debugging of systems using AT89C51RB2/RC2
without removing the circuit from the board. The ONCE mode is invoked by driving cer-
tain pins of the AT89C51RB2/RC2; the following sequence must be exercised:
•
•
While the AT89C51RB2/RC2 is in ONCE mode, an emulator or test CPU can be used to
drive the circuit. Table 61 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 61. External Pin Status during ONCE Mode
Weak pull-up
Pull ALE low while the device is in reset (RST high) and PSEN is high.
Hold ALE low as RST is deactivated.
ALE
Weak pull-up
PSEN
Port 0
Float
Weak pull-up
Port 1
Weak pull-up
AT89C51RB2/RC2
Port 2
Weak pull-up
Port 3
XTAL1/2
Active
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