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How to reset input to the RESET pin when turning the power off?

Latest Updated:10/06/2010

Question:

When using a hardware reset, what should be done to the reset input to the RESET pin when turning the power off (when the supply voltage falls)?

Answer:

When the supply voltage falls while the MCU operates within the range of the recommended operating conditions for the supply voltage, apply the following to the RESET pin:

  1. Apply a low to the RESET pin until the supply voltage falls below the range of the recommended operating conditions.
  2. Hold the RESET pin low while the supply voltage is below the range of the recommended operating conditions.

* Refer to the electrical characteristics for the recommended operating conditions of the supply voltage.

Suitable Products
R8C/3x
R8C/38A
R8C/Lx
R8C/Mx