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R8C/20 Datasheet(PDF) 428 Page - Renesas Technology Corp |
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R8C/20 Datasheet(HTML) 428 Page - Renesas Technology Corp |
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428 / 501 page  R8C/20 Group, R8C/21 Group 20. Electrical Characteristics Rev.2.00 Aug 27, 2008 Page 412 of 458 REJ09B0250-0200 Figure 20.2 Time delay until Suspend NOTES: 1. The measurement condition is VCC = 2.7 V to 5.5 V and Topr = -40 °C to 85°C (J version) / -40°C to 125°C (K version). 2. Necessary time until the voltage detection circuit operates when setting to 1 again after setting the VCA26 bit in the VCA2 register to 0. 3. Hold Vdet2 > Vdet1. 4. This parameter shows the voltage detection level when the power supply drops. The voltage detection level when the power supply rises is higher than the voltage detection level when the power supply drops by approximately 0.1 V. 5. Time until the voltage monitor 1 reset is generated after the voltage passes Vdet1 when VCC falls. When using the digital filter, its sampling time is added to td(Vdet1-A). When using the voltage monitor 1 reset, maintain this time until VCC = 2.0 V after the voltage passes Vdet1 when the power supply falls. NOTES: 1. The measurement condition is VCC = 2.7 V to 5.5 V and Topr = -40 °C to 85°C (J version) / -40°C to 125°C (K version). 2. Time until the voltage monitor 2 reset/interrupt request is generated since the voltage passes Vdet2. 3. Necessary time until the voltage detection circuit operates when setting to 1 again after setting the VCA27 bit in the VCA2 register to 0. 4. Hold Vdet2 > Vdet1. 5. When using the digital filter, its sampling time is added to td(Vdet2-A). When using the voltage monitor 2 reset, maintain this time until VCC = 2.0 V after the voltage passes Vdet2 when the power supply falls. Table 20.6 Voltage Detection 1 Circuit Electrical Characteristics Symbol Parameter Condition Standard Unit Min. Typ. Max. Vdet1 Voltage detection level(3, 4) 2.70 2.85 3.00 V td(Vdet1-A) Voltage monitor 1 reset generation time(5) − 40 200 µs − Voltage detection circuit self power consumption VCA26 = 1, VCC = 5.0 V − 0.6 −µA td(E-A) Waiting time until voltage detection circuit operation starts(2) −− 100 µs Vccmin MCU operating voltage minimum value 2.70 −− V Table 20.7 Voltage Detection 2 Circuit Electrical Characteristics Symbol Parameter Condition Standard Unit Min. Typ. Max. Vdet2 Voltage detection level(4) 3.3 3.6 3.9 V td(Vdet2-A) Voltage monitor 2 reset/interrupt request generation time(2, 5) − 40 200 µs − Voltage detection circuit self power consumption VCA27 = 1, VCC = 5.0V − 0.6 −µA td(E-A) Waiting time until voltage detection circuit operation starts(3) −− 100 µs FMR46 Suspend request (Maskable interrupt request) Fixed time td(SR-SUS) Clock-dependent time Access restart |
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