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DatasheetsP89V51RB2, RC2, RD2
CategoryIntegrated Circuits (ICs)
FamilyEmbedded - Microcontrollers
Core Processor8051
Core Size8-Bit
ConnectivitySPI, UART/USART
PeripheralsBrown-out Detect/Reset, POR, PWM, WDT
Number of I/O32
Program Memory Size64KB (64K x 8)
Program Memory TypeFLASH
RAM Size1K x 8
Voltage - Supply (Vcc/Vdd)4.5 V ~ 5.5 V
Data Converters-
Oscillator TypeInternal
Operating Temperature-40°C ~ 85°C
Package / Case40-DIP (0.600", 15.24mm)
Supplier Device Package40-DIP
Other Names568-2431-5


The P89V51RB2, P89V51RC2, P89V51RD2 are 8051 microcontrollers with 16/32/64 kB flash and 1024 B of data RAM. An important feature of the P89V51RB2/RC2/RD2 is its X2 mode option. The Programmer can choose to run the application with the conventional 80C51 clock rate (12 clocks per machine cycle) or select the X2 mode (six clocks per machine cycle) to achieve twice the throughput at the same clock frequency. Other way to benefit from this feature is to keep the same performance by reducing the clock frequency by half, dramatically reducing the EMI.

The flash program memory in P89V51RD2 supports both parallel programming and in serial ISP(In circuit Serial Programming). The P89V51RB2, P89V51RC2, P89V51RD2 is also capable of IAP(In Application programming), allowing the flash program memory to be reconfigured even while the application is running.

Features of P89V51RD2

  • 8051 CPU
  • 5 V operating voltage f
  • Operating Frequency from 0 MHz to 40 MHz
  • 16,32,64 kB of on-chip flash user code memory with ISP and IAP
  • Supports 12-clock (default) or 6-clock mode selection via software or ISP
  • SPI and enhanced UART
  • PCA(Programmable counter array) with PWM and capture/compare functions
  • Four 8-bit I/O ports with three high-current port 1 pins
  • Three 16-bit timers and counters
  • Programmable watchdog timer
  • Eight interrupt sources with four priority levels
  • Second DPTR(Data pointer) register
  • Low EMI mode (ALE inhibit)
  • TTL- and CMOS-compatible logic levels
  • Brownout detection
  • Low power modes
  • Power-down mode with external interrupt wake-up
  • Idle mode
  • Available Packages-DIP40, PLCC44 and TQFP44 packages

Pin Diagram of P89V51RD2