uPD789074 Subseries 8-Bit Single-Chip Microcontrollers UD - Home

CHAPTER 16 ELECTRICAL SPECIFICATIONS (CONVENTIONAL PRODUCTS)System Clock Oscillator Characteristics (TA = −40 to +85°C, VDD = 1.8 to 5.5 V)Resonator Recommended Circuit Parameter Conditions MIN. TYP. MAX. UnitCeramicVSSX1X2Oscillation frequencyVDD = oscillation voltage1.0 5.0 MHzresonator(fX) Note 1rangeC1C2Oscillation stabilizationAfter VDD reaches oscillation4 mstime Note 2voltage range MIN.CrystalresonatorVSSX1X2Oscillation frequency1.0 5.0 MHz(fX) Note 1C1C2Oscillation stabilizationVDD = 4.5 to 5.5 V 10 mstime Note 2 VDD = 1.8 to 5.5 V 30 msExternalX1X2X1 input frequency (fX) Note 1 1.0 5.0 MHzclockX1 input high-/low-level width(tXH, tXL)85 500 nsX1X2X1 input frequency (fX) Note 1 VDD = 2.7 to 5.5 V 1.0 5.0 MHzOPENX1 input high-/low-level width(tXH, tXL)VDD = 2.7 to 5.5 V 85 500 nsNotes 1. Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.2. Time required to stabilize oscillation after reset or STOP mode release. Use the resonator thatstabilizes oscillation within the oscillation wait time.Caution When using the system clock oscillator, wire as follows in the area enclosed by the broken linesin the above figures to avoid an adverse effect from wiring capacitance.• Keep the wiring length as short as possible.• Do not cross the wiring with the other signal lines.• Do not route the wiring near a signal line through which a high fluctuating current flows.• Always make the ground point of the oscillator capacitor the same potential as VSS.• Do not ground the capacitor to a ground pattern through which a high current flows.• Do not fetch signals from the oscillator.210User’s Manual U14801EJ3V1UD