P89C51RB2

• 80C51 Central Processing Unit
• On-chip Flash Program Memory with In-System Programming
   (ISP) and In-Application Programming (IAP) capability
• Boot ROM contains low level Flash programming routines for downloading via the UART
• Can be programmed by the end-user application (IAP)
• Parallel programming with 87C51 compatible hardware interface to programmer
• Six clocks per machine cycle operation (standard)
• 12 clocks per machine cycle operation (optional)
• Speed up to 20 MHz with 6 clock cycles per machine cycle
   (40 MHz equivalent performance); up to 33 MHz with 12 clocks per machine cycle
• Fully static operation
• RAM expandable externally to 64 kbytes
• Four interrupt priority levels
• Seven interrupt sources
• Four 8-bit I/O ports
• Full-duplex enhanced UART
Framing error detection
Automatic address recognition
• Power control modes
Clock can be stopped and resumed
Idle mode
Power down mode
• Programmable clock out
• Second DPTR register
• Asynchronous port reset
• Low EMI (inhibit ALE)
• Programmable Counter Array (PCA)
PWM
Capture/compare

The P89C51RB2/RC2/RD2Hxx device contains a non-volatile 16KB/32KB/64KB Flash program memory that is both parallel programmable and serial In-System and In-Application Programmable. In-System Programming (ISP)P89C51RB2/RC2/RD2Hxx allows the user to download new code while the microcontroller sits in the application.In-Application Programming (IAP) means that the microcontroller fetches new program code and reprograms itself while in the system.

P89C51RB2/RC2/RD2Hxx allows for remote programming over a modem link.A default serial loader (boot loader) program in ROM allows serial In-System programming of the Flash memory via the UART without the need for a loader in the Flash code. For In-Application Programming, the user program erases and reprograms the Flash memory by use of standard routines contained in ROM.P89C51RB2/RC2/RD2Hxx executes one machine cycle in 6 clock cycles, hence providing twice the speed of a conventional 80C51. An OTP configuration bit lets the user select conventional 12 clock timing if desired.

P89C51RB2/RC2/RD2Hxx is a Single-Chip 8-Bit Microcontroller manufactured in advanced CMOS process and is a derivative of the 80C51 microcontroller family. The instruction set is 100% compatible with the 80C51 instruction set.

The P89C51RB2/RC2/RD2Hxx also has four 8-bit I/O ports, three 16-bit timer/event counters, a multi-source, four-priority-level, nested interrupt structure, an enhanced UART and on-chip oscillator and timing circuits.

The added features of the P89C51RB2/RC2/RD2Hxx makes it a powerful microcontroller for applications that require pulse width modulation, high-speed I/O and up/down counting capabilities suchas motor control.