CHAPTER 20 ELECTRICAL SPECIFICATIONS
User’s Manual
U15075EJ2V1UD
318
RC oscillation (mask option)
(T
A
= –40 to +85
°
C, V
DD
= 1.8 to 5.5 V)
Resonator Recommended
Circuit Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Oscillation frequency
(f
CC
)
Notes 1,2
V
DD
= Oscillation
voltage range
2.0 4.0
MHz
V
DD
= 2.7 to 5.5 V
32
µ
s
RC resonator
CL2
CL1
Oscillation
stabilization time
Note 3
V
DD
= 1.8 to 5.5 V
128
µ
s
CL1 input frequency
(f
CC
)
Note 1
1.0
4.0
MHz
External clock
CL1
CL2
OPEN
CL1 input high-/low-
level width (t
XH
,t
XL
)
100 500
ns
Notes 1.
Indicates only oscillator
characteristics. Refer to
AC Characteristics
for instruction execution time.
2.
Variations in external resistance and external capacitance are not included.
3.
Time required to stabilize oscillation after reset or STOP mode release.
Cautions 1. When using the main system clock oscillator, wire as follows in the area enclosed by the
broken lines in the above figure 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 V
SS
.
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
2. When the main system clock is stopped and the device is operating on the subsystem clock,
wait until the oscillation stabilization time has been secured by the program before switching
back to the main system clock.
RC Oscillation Frequency Characteristics (T
A
= –40 to +85
°
C, V
DD
= 1.8 to 5.5 V)
Parameter Symbol
Conditions
MIN.
TYP.
MAX.
Unit
f
cc1
V
DD
= 2.7 to 5.5 V
1.5
2.0
2.5
MHz
f
cc2
R = 11.0 k
Ω
,
C = 22 pF
V
DD
= 1.8 to 5.5 V
0.5
2.0
2.5
MHz
f
cc3
V
DD
= 2.7 to 5.5 V
2.5
3.0
3.5
MHz
f
cc4
R = 6.8 k
Ω
,
C = 22 pF
V
DD
= 1.8 to 5.5 V
0.75
3.0
3.5
MHz
f
cc5
V
DD
= 2.7 to 5.5 V
3.5
4.0
4.7
MHz
Oscillation frequency
f
cc6
R = 4.7 k
Ω
,
C = 22 pF
V
DD
= 1.8 to 5.5 V
1.0
4.0
4.7
MHz
Remark
The TYP. value of the oscillation frequency falls within a range of 2.0 to 4.0 MHz, so set RC to one of
the above values.
