UPD78P4916 Datasheet, PDF (29/56 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER

µPD78P4916
Oscillator Characteristics (Main Clock) (TA = –10 to +70 ˚C, VDD = AVDD = 4.0 to 5.5 V, VSS = AVSS = 0 V)
Resonator
Crystal resonator
Recommended circuit
Item
Oscillation frequency (fXX)
MIN.
4
MAX.
16
Unit
MHz
X1
X2 VSS
C1 C2
Oscillator Characteristics (Subclock) (TA = –10 to +70 ˚C, VDD = AVDD = 2.7 to 5.5 V, VSS = AVSS = 0 V)
Resonator
Crystal resonator
Recommended circuit
Item
Oscillation frequency (fXT)
MIN. MAX. Unit
32
35
kHz
XT1 XT2 VSS
C1 C2
Caution When using the main system clock and subsystem clock oscillators, wiring in the area enclosed
with the dotted lines should be carried out as follows to avoid an adverse effect from wiring
capacitance:
• Wiring should be as short as possible.
• Wiring should not cross other signal lines.
Wiring should not be placed close to a varying high current.
• The potential of the oscillator capacitor ground should be the same as VSS.
Do not ground wiring to a ground pattern in which high current flows.
• Do not fetch a signal from the oscillator.
As the amplification degree of the subsystem clock oscillator is low to reduce current
consumption, pay particular attention to the wiring method.
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