DATA PROCESSOR

摘要

PROBLEM TO BE SOLVED: To shorten a time needed for stabilization of a clock oscillation and also to effectively operate a peripheral circuit for reduction of power consumption of a data processor by supplying a generated alternate clock to the peripheral circuit in a power saving mode. SOLUTION: A peripheral circuit oscillation circuit 1 is operated in a sleep mode by an external trigger signal EXTTRG. Then only an AD converter 2 serving as a peripheral circuit can be operated by a generated peripheral circuit clockϕCR in a sleep mode and at a speed accordant with the clockϕCR. Thus, it's not required to cancel the sleep mode nor to actuate a system clockϕ. Then only the peripheral circuit is effectively operated with the reduction of power consumption. When the AD conversion is over in a sleep mode, a single-chip microcomputer 200 can be started by the clockϕwhich is outputted from the circuit 1.