Intel 8051 and 80C51 are members of Intel MCS-51 family of 8-bit microcontrollers.
In addition to on-chip clock oscillator, 2 16-bit timers, 4 I/O ports and a serial port,
all 8051 and 80C51 chips have 128 bytes of RAM and 4 KB masked ROM. If necessary,
8051 memory can be expanded up to 128 KB by adding up to 64 KB of external program and data memory.
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