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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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4502 датащи(PDF) 39 Page - Renesas Technology Corp |
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4502 датащи(HTML) 39 Page - Renesas Technology Corp |
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39 / 116 page  4502 Group Rev.3.01 2005.02.02 page 39 of 112 REJ03B0105-0301 VOLTAGE DROP DETECTION CIRCUIT The built-in voltage drop detection circuit is designed to detect a drop in voltage and to reset the microcomputer if the supply voltage drops below a set value. Fig. 37 Voltage drop detection circuit Fig. 38 Voltage drop detection circuit operation waveform example + – VRST VDD Q S R Reset signal Return input EPOF instruction +POF2 instruction (continuous execution) (Note 2) Voltage drop detection circuit reset signal (Note 1) Voltage drop detection circuit Notes 1: In the RAM back-up mode by the POF2 instruction, the voltage drop detection circuit stops. 2: When the VDD (supply voltage) is VRST (detection voltage) or less, the voltage drop detection circuit reset signal is output. VDD The microcomputer starts operation after the on-chip oscillator (internal oscillator) is counted 5359 times. Note 3 Voltage drop detection circuit reset signal RESET pin Notes 1: After system is released from reset, the on-chip oscillator (internal oscillator) is selected as the operation clock of the microcomputer. 2: Refer to the voltage drop detection circuit characteristics in the electrical characteristics for the rating value of VRST (detection voltage). 3: The VRST (detection voltage) does not include hysteresis. |
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