PURPOSE: To record a secular change with a small quantity of a memory by providing an independent logic circuit from a CPU block, generating an interrupting signal with a clock function block and executing the interrupting processing.
CONSTITUTION: An IC card is composed of a CPU block, a memory block and a clock function block. A CPU block is synchronized with an external input clock signal, reads and sets the conditions to store the setting of the conditions of a clock function by an external resetting signal. When an input signal is processed from an external part and an interrupting signal is inputted from a clock function block, the data are written to the storing address of a memory designated by the function of a time. The contents stored into the memory by an external signal are sent to the external part. A clock function block executes the clock function from an external input clock signal and from action conditions instructed from the CPU block, the interrupting signal is sent to the CPU block for a constant period.
TAKI TAISEI
YAMAMOTO KEIICHI
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