CHAPTER 23 ELECTRICAL SPECIFICATIONS (TARGET)
Preliminary User’s Manual U16846EJ1V0UD
373
External RC Oscillator Characteristics (T
A
=
−
40 to +85
°
C, 2.7 V
≤
V
DD
≤
5.5 V, 2.7 V
≤
AV
REF
≤
V
DD
, V
SS
= 0 V)
Resonator Recommended
Circuit
Parameter
Conditions MIN.
TYP.
MAX.
Unit
RC oscillation
V
SS
CL1
CL2
R
C
Oscillation frequency
(f
XP
)
3.0
4.0
MHz
4.0 V
≤
V
DD
≤
5.5 V
2.0
16
3.3 V
≤
V
DD
< 4.0 V
2.0
8.38
X1 input frequency
(f
XP
)
Note
2.7 V
≤
V
DD
< 3.3 V
2.0
5.0
MHz
4.0 V
≤
V
DD
≤
5.5 V
30
500
3.3 V
≤
V
DD
< 4.0 V
56
500
External clock
X2
X1
X1 input high-/low-
level width (t
XH
, t
XL
)
2.7 V
≤
V
DD
< 3.3 V
96
500
ns
Note Indicates
only
oscillator
characteristics. Refer to AC Characteristics for instruction execution time.
Caution When using the RC 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.
External RC Oscillation Frequency Characteristics (T
A
=
−
40 to +85
°
C)
Resonator Conditions
MIN.
TYP.
MAX.
Unit
R = 6.8 k
Ω
, C = 22 pF
Target value: 3 MHz
2.7 V
≤
V
DD
≤
5.5 V
2.5
3.0
3.5
MHz
Oscillation frequency
(f
XP
)
R = 4.7 k
Ω
, C = 22 pF
Target value: 4 MHz
2.7 V
≤
V
DD
≤
5.5 V
3.5
4.0
4.7
MHz
Caution Set one of the above values to R and C.
Ring-OSC Oscillator Characteristics (T
A
=
−
40 to +85
°
C, 2.0 V
≤
V
DD
≤
5.5 V, 2.0 V
≤
AV
REF
≤
V
DD
, V
SS
= AV
SS
= 0 V)
Resonator Parameter
Conditions
MIN.
TYP.
MAX.
Unit
On-chip Ring-OSC oscillator
Oscillation frequency (f
R
)
120 240 480 kHz