This section describes the access timing during the execution of ATmega168 instructions. The AVR CPU is driven by the system clock clkCPU. This clock comes directly from the selected clock source. This clock is not divided inside the chip.
Figure 6 illustrates the concept of parallel instruction fetch and instruction execution determined by the Harvard architecture, as well as the register file that can be accessed quickly. This is a basic pipeline concept with a performance of up to 1 MIPS/MHz, and has excellent price/performance, function/clock ratio, and function/power ratio.
Figure 7 shows the internal access timing of the ATmega168 register file. In one clock cycle, the ALU can operate on two register operands at the same time and save the result to the destination register.
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