SEMICONDUCTOR INTEGRATED CIRCUIT WITH BUILT-IN NON- VOLATILE MEMORY CIRCUIT

摘要

PROBLEM TO BE SOLVED: To enable the write and erasure of a memory by forming a write pulse or erase pulse having an exact pulse width even when an oscillation frequency is dispersed by a process dispersion in the semiconductor integrated circuit of a microcomputer or the like with built-in non-volatile memory circuit and oscillator. SOLUTION: The semiconductor integrated circuit of the microcomputer or the like with built-in non-volatile memory circuit and oscillator is provided with trimming circuits capable of regulating the oscillation frequency of an internal oscillator(OSC), a first counter 31 for counting the oscillation frequency of the oscillator, a second counter 32 for counting a clock supplied from the outside or clock derived from that clock and a frequency measuring means (CPU 34) for comparing the count value of the first counter with the count value of the second counter and discriminating one frequency from the other frequency.