upd78f0134hgka1-9et-a Renesas Electronics Corporation., upd78f0134hgka1-9et-a Datasheet - Page 498

• Manufacturer Part Number: upd78f0134hgka1-9et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(T
Subsystem Clock Oscillator Characteristics
(T
Notes 1. Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
Cautions 1. When using the subsystem clock oscillator, wire as follows in the area enclosed by the broken
Remark For the resonator selection and oscillator constant, customers are requested to either evaluate the
498
Internal Oscillator Characteristic
On-chip internal oscillator
Crystal resonator
External clock
A
A
= 40 to +110 C, 2.0 V
= 40 to +110 C, 2.7 V
Resonator
2. Input a clock signal to the XT1 pin and input the inverse clock signal to the XT2 pin.
2. The subsystem clock oscillator is designed as a low-amplitude circuit for reducing power
oscillation themselves or apply to the resonator manufacturer for evaluation.
Resonator
Note 2
lines in the above figure to avoid an adverse effect from wiring capacitance.
consumption, and is more prone to malfunction due to noise than the high-speed system clock
oscillator. Particular care is therefore required with the wiring method when the subsystem
clock is used.
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
Do not ground the capacitor to a ground pattern through which a high current flows.
Do not fetch signals from the oscillator.
Recommended
V
XT2
CHAPTER 30 ELECTRICAL SPECIFICATIONS ((A1) GRADE PRODUCTS)
SS
C4
Rd
Circuit
XT2
C3
V
V
DD
DD
XT1
XT1
Oscillation frequency (f
= EV
= EV
Oscillation frequency
(f
XT1 input frequency
(f
XT1 input high-/low-level
width (t
DD
DD
XT
XT
Parameter
)
)
Note
Note
5.5 V, 2.7 V
5.5 V, 2.7 V
XTH
User’s Manual U16899EJ3V0UD
Parameter
, t
XTL
)
R
)
AV
AV
REF
REF
V
V
DD
DD
Conditions
, V
, V
Conditions
SS
SS
= EV
= EV
SS
SS
= AV
= AV
SS
SS
MIN.
120
MIN.
= 0 V)
= 0 V)
32
32
12
TYP.
32.768
240
TYP.
SS
MAX.
490
MAX.
.
38.5
15.6
35
Unit
kHz
Unit
kHz
kHz
s