MCS(R)251 Microcontroller

The Intel 8XC251SA/SB/SP/SQ is based on the new high performance MCS 251 microcontroller architecture. Being a member of the MCS 251 microcontroller family, the 8XC251SA/SB/SP/SQ has the same advanced register based CPU architecture and a pipelined instruction execution unit. It uses the powerful MCS 251 microcontroller instruction set, with many enhanced 8-, 16- and 32-bit instructions available. The new microcontroller is also specially designed to execute C code efficiently. Most importantly, the 8XC251SA/SB/SP/SQ is binary code and pin compatible with existing MCS 51 microcontroller applications.
The 8XC251SA/SB/SP/SQ features a rich combination of integrated peripherals that make it an even more powerful microcontroller. The Programmable Counter Array (PCA) provides the flexibility for applications that require real time compare/capture, high speed I/O and pulse width modulation capabilities. Also included is an enhanced serial port for multi-processor communications, a hardware watchdog timer, a program lock scheme for on-chip program memory and two power saving modes: idle mode and powerdown mode.
The 8XC251SA/SB/SP/SQ has 1 Kbyte or 512 bytes on-chip data RAM and is avail-able with 16 Kbytes or 8 Kbytes of on-chip OTPROM/EPROM (87C251SA/SB/SP/SQ), or ROM (83C251SA/SB/SP/SQ), or ROMless (80C251SB/SQ) options. The 8XC251SA/SB/SP/SQ operates from static standby to 16 MHz clock frequency and is available in 44-pin PLCC, 40-pin PDIP and 40-pin windowed Ceramic DIP package options.