Why does a microcomputer run at low speeds when microcomputer clock is removed midway or stopped forcibly and externally?
• Answer :The possible reason is that, since the PLL is continuing to run even if PLL mounted on the microcomputer stops supplying oscillation, the CPU is operating at low speeds. From an oscillation mechanism viewpoint, at normal operation (when the oscillator is connected), PLL cycles are adjusted by using the cycle of the external oscillator as the reference at setting of internal PLL and the CPU operates at an adjusted PLL frequency. So, when a clock is stopped in that status, the built-in PLL attempts to adjust itself to the stopped clock, thus causing the PLL to gradually slow down and continues to run. This low-speed operation cannot be ensured because it varies depending on products.
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