Intel MCS-48

Intel 8048 registers
	Main registers
PC	Program Counter
	Program Status Word
	Note: All other programmer-visible registers and stack are allocated in RAM.

The MCS-48 microcontroller series, Intel's first microcontroller, was originally released in 1976. Its first members were 8048, 8035 and 8748. The 8048^[1] is arguably the most prominent member of the family. Initially, this family was produced using NMOS (n-type metal–oxide–semiconductor) technology. In the early 1980s, it became available in CMOS technology. It was manufactured into the 1990s to support older designs that still used it.

The MCS-48 series has a modified Harvard architecture, with internal or external program ROM and 64 to 256 bytes of internal (on-chip) RAM. The I/O is mapped into its own address space, separate from programs and data.

Though the MCS-48 series was eventually replaced by the very successful MCS-51 series, it remained quite popular even by the year 2000 due to its low cost, wide availability, memory-efficient one-byte instruction set, and mature development tools. Because of this, it is used in high-volume, cost-sensitive consumer electronics devices such as TV remotes, computer keyboards, and toys.

^ Laws, David; Blume Jr., Henry; Ekiss, John; Feng, Yung; Kline, Barbara; Raphael, Howard; Stamm, David (2008-07-30). Oral History Panel on the Development and Promotion of the Intel 8048 Microcontroller (PDF). Archived from the original (PDF) on 2014-12-27.

[computerHistory-1] Laws, David; Blume Jr., Henry; Ekiss, John; Feng, Yung; Kline, Barbara; Raphael, Howard; Stamm, David (2008-07-30). Oral History Panel on the Development and Promotion of the Intel 8048 Microcontroller (PDF). Archived from the original (PDF) on 2014-12-27.

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