Patent ID: 6032221
Filing Date: 2000-02-29
Classification: G11C

Abstract:
A flash memory embedded microcomputer comprising:a flash memory;a flash supply voltage generator provided in said flash memory for generating supply voltages of said flash memory;flash memory power supply lines provided in said flash memory for conveying said supply voltages;an A/D converter for converting an input signal to the microcomputer into a digital signal;first voltage transfer means for interruptibly connecting one or more input ports of the microcomputer to an analog input terminal of said A/D converter;second voltage transfer means for interruptibly connecting each of said flash memory power supply lines to said analog input terminal of said A/D converter; anda CPU for bringing said first voltage transfer means into a conducting state and said second voltage transfer means into a nonconducting state in a normal operation mode, for bringing said first voltage transfer means into the nonconducting state and said second voltage transfer means into the conducting state in a voltage measurement mode of measuring voltages on said flash memory power supply lines, and for controlling reading of a conversion result of said A/D converter.