89C51

80C51 Central Processing Unit
On-chip FLASH Program Memory
Speed up to 33 MHz
Full static operation
RAM expandable externally to 64 k bytes
4 level priority interrupt
6 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)
3 16-bit timers
Wake up from power down by an external interrupt

The 89C51/89C52/89C54/89C58 contain a non-volatile FLASH program memory that is parallel programmable. For devices that are serial programmable (In System Programmable (ISP) with a boot loader), see the 89C51RC+/89C51RD+ datasheet.
Both families are Single-Chip 8-bit Microcontrollers manufactured in advanced CMOS process and are derivatives of the 80C51 microcontroller family. All the devices have the same instruction set as the 80C51.