3.1 CPU The dsPIC33AK family of devices have a CPU architecture
featuring a 5-stage interlocked instruction pipeline, speculative execution and prefetch branch prediction to reduce conditional branch latency.
In addition, a 2kB instruction cache is implemented for faster access times. Due to the architecture
changes, the oscillator frequency is now equal to the instruction cycle frequency (MHz = MIPS).
(dsPIC33CK to dsPIC33AK Migration and Performance Enhancement Guide. DS70005574A)