The MCS® 151 microcontroller is Intel's latest addition to the classic MCS® 51 controller family. It is instruction-set compatible with the MCS 51 microcontroller and pin-compatible with both the MCS 51 and the MCS 251 microcontrollers, providing backwards and forwards compatibility within the MCS 51 architecture line.

In Intel tests, the MCS 151 microcontroller's fast pipelining provided up to five times the performance of MCS 51 microcontrollers at the same clock speed. Because it is instruction set- and pin-compatible with the MCS 51 microcontroller, the MCS 151 microcontroller can be used as an easy “drop in” replacement for MCS 51 controllers, providing a quick performance upgrade with zero development. And because it is pin- and peripheral-compatible with the MCS® 251 controller, the MCS 151 also provides embedded designers with a direct upgrade path to even more performance and advanced features in the future.

The MCS 151 microcontroller has 256 bytes of on-chip RAM and is available with 8/16 Kbytes of on-chip ROM/OTPROM or ROMless. Key new features include a pipelined CPU, 16-bit internal code bus, page mode external code fetch configuration, and external wait state capability. Also included is a programmable counter array for applications that require real-time compare/capture, high-speed I/O and pulse width modulation, an enhanced serial port for multi-processor communication, a hardware watchdog timer and power management modes.

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