Small 8051
Low-cost members of the 8051 family with reduced number of port pins, and no support for off-chip memory. Typical application: Low-cost consumer goods.
Standard 8051: The Small 8051s and the Extended 8051s are derived
Extended 8051:Members of the 8051 family with extended range of no-chip facilities (e.g. CAN controllers, ADC, DAC,etc), large numbers of port pins, and - in recent devices - support for large amounts of off-chip memory. Typical applications: Industrial and automotive systems.
Clock frequency and performance
All digital computer systems are driven by some form of oscillator circuit: the 8051 is certainly
no exception. If the oscillator fails, the system will not function at all; if the oscillator runs
irregularly, any timing calculations performed by the system will be inaccurate.
Low-cost members of the 8051 family with reduced number of port pins, and no support for off-chip memory. Typical application: Low-cost consumer goods.
Standard 8051: The Small 8051s and the Extended 8051s are derived
Extended 8051:Members of the 8051 family with extended range of no-chip facilities (e.g. CAN controllers, ADC, DAC,etc), large numbers of port pins, and - in recent devices - support for large amounts of off-chip memory. Typical applications: Industrial and automotive systems.
Clock frequency and performance
All digital computer systems are driven by some form of oscillator circuit: the 8051 is certainly
no exception. If the oscillator fails, the system will not function at all; if the oscillator runs
irregularly, any timing calculations performed by the system will be inaccurate.
