Intermittent operation circuit

An intermittent operation circuit comprising:

• an internal clock oscillating means for generating an internal clock signal;
• a central processing means which operates in synchronism with the internal clock signal generated by said internal clock oscillating means, and stops an operation of said internal clock oscillating means when the mode is transferred to a low consuming power mode in which the operation of itself is temporarily stopped;
• a charge/discharge means in which, when said central processing means stops the operation of said internal clock oscillating means, a charging is started after discharging a stored charge once;
• and
• an interruption control means which starts the operations of said internal oscillating means and said central processing means when a charge level of the charge stored in said charge/discharge means is once lowered and the charge level reaches or exceeds a predetermined value.