Intel 8021

Historia

The MCS-48 microcontroller (µC) series, Intels first microcontroller, was originally released in 1976. Its first members were 8048, 8035 and 8748. 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 still 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 64–256 bytes of internal (on-chip) RAM. The I/O is mapped into its own address space, separate from programs and data. The 8048 is probably the most prominent member of Intels MCS-48 family of microcontrollers. Device Internal Memory Remarks 8020 1K × 8 ROM 64 × 8 RAM subset of 8048, 20 pins, only 13 I/O lines 8021 1K × 8 ROM 64 × 8 RAM subset of 8048, 28 pins, 21 I/O lines 8022 2K × 8 ROM 64 × 8 RAM subset of 8048, A/D-converter 8035 none 64 × 8 RAM 8039 none 128 × 8 RAM 8040 none 256 × 8 RAM 8048 1K × 8 ROM 64 × 8 RAM 8049 2K × 8 ROM 128 × 8 RAM 8050 4K x 8 ROM 256 × 8 RAM 8748 1K × 8 EPROM 64 × 8 RAM 8749 2K × 8 EPROM 128 × 8 RAM 87P50 ext. ROM socket 256 × 8 RAM Has piggy-back socket for 2758/2716/2732 EPROM. 8648 1K × 8 OTP EPROM 64 × 8 RAM factory OTP EPROM