The MCS-51 Family includes 2 timers and 4 ports as well as 128bytes or more of on board RAM. The 51 is one of the most popular MCUs on the market. It is now being made in speeds of up to 100MHz by SiLabs, while Intel continues to make them up to 33MHz.
MCS-51 8031 128*8 RAM ROMless 8032 256*8 RAM ROMless 8044 192*8 RAM 64K*8 ROM RUPI Serial 8051 128*8 RAM 4k*8 ROM 8052 256*8 RAM 8K*8 ROM 8053 128*8 RAM 8k*8 ROM 8054 256*8 RAM 16k*8 ROM 8058 256*8 RAM 32k*8 ROM ------------------------- This is a very rare Engineering Evaluation Sample