8051 might run at 12 MHz, but actual instructions run in multiples of 12 clock cycles. Realistic code on a 8051 runs only about 450k-800k instructions per seco

8051 might run at 12 MHz, but actual instructions run in multiples of 12 clock cycles. Realistic code on a 8051 runs only about 450k-800k instructions per second @12 MHz.