A/D converter preventing results of A/D conversion from being overwritten

An A/D converter for A/D-converting analog signals input from a plurality of channels, comprising:

• a channel-selecting section selecting channels from said plurality of channels, for A/D conversion of the analog signals;
• an A/D conversion section sequentially A/D-converting the analog signals from the selected channels on a channel-by-channel basis;
• a FIFO including a plurality of stages of storage areas, and sequentially storing results of A/D conversion on a channel-by-channel basis in different ones of the plurality of stages;
• a stage number-counting section counting a number of stages of said FIFO where the results of A/D conversion are stored;
• an interrupt-generating stage number-setting section setting an interrupt-generating stage number;
• and
• an interrupt signal-delivering section delivering an interrupt signal for requesting a control circuit reading the results of A/D conversion to read the results of A/D conversion, when the number of stages counted by said stage number-counting section becomes equal to the interrupt-generating stage number.