UPD784907 Datasheet, PDF (72/98 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER

µPD784907, 784908
Main Oscillator Characteristics (TA = –40 to +85°C, VDD = 3.5 to 5.5 V, VSS = 0 V)
Parameter
Symbol
Conditions
MIN.
Oscillator frequency
fXX
Ceramic resonator or crystal resonator
2
MAX.
12.58
Unit
MHz
Caution When using the clock generator, wire to avoid adverse influence from wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross the wiring with other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating current flows.
• Make the ground point of the oscillator capacitor the same potential as VSS1. Do not ground
the capacitor to a ground pattern in which a high current flows.
• Do not fetch signals from the oscillator.
Remark Connect a 12.582912 MHz or 6.291456 MHz oscillator to operate the internal clock timer with the main
clock.
Clock Oscillator Characteristics (TA = –40 to +85°C, VDD = 3.5 to 5.5 V, VSS = 0 V)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Oscillator frequency
fXT
Ceramic resonator or crystal resonator
32
32.768
35
kHz
Oscillation stabilization tSXT
time
VDD = 4.5 to 5.5 V
1.2
2
s
10
s
Oscillation hold voltage
Watch timer operating
voltage
VDDXT
VDDW
3.5
5.5
V
3.5
5.5
V
72
Data Sheet U11680EJ2V0DS00