RESET CONTROL CIRCUIT

PROBLEM TO BE SOLVED: To provide a reset control circuit improving a security level of a semiconductor integrated circuit in a hardware state.SOLUTION: In the reset control circuit 1, a setting value of reset release timing is previously written in a memory 11, a counter 12 performs free running ope...

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1. Verfasser: MIZUTANI TATSUO
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a reset control circuit improving a security level of a semiconductor integrated circuit in a hardware state.SOLUTION: In the reset control circuit 1, a setting value of reset release timing is previously written in a memory 11, a counter 12 performs free running operation when powered on, a trigger signal output part 13 outputs a trigger signal in each output of an overflow signal from the counter 12, a capture part 14 captures a count value of the counter 12 when an input reset signal comes into a reset release state after the output of the trigger signal, a comparison part 15 compares whether the count value captured by the capture part 14 accords with the reset release timing setting value stored in the memory 11, and an AND gate 16 takes AND between the reset signal and output of the comparison part 15, and outputs it as an internal reset signal.