In this paper, the comparsion between pulse width modulation(PWM), Direct Memory Access(DMA), power supply and current consumption by peripherals and core in five processors viz., SAMD21G18A, TMS570LS0432, AM3352BZCED60, AM1808EZCE and XCZU3EG-1SBVA484E is studied from designing point of view in applications where power generation, power consumption and autonomy is critical. The contrast has been drawn from datasheets, reference manual and minor calculations and is basically a synopsis.