upd78p058f Renesas Electronics Corporation., upd78p058f Datasheet - Page 33

• Manufacturer Part Number: upd78p058f
• Description: Mos Intergrated Circuit, 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Subsystem Clock Oscillator Characteristics (T
Notes 1. Only the oscillator characteristics are shown. See the AC characteristics for instruction execution times.
Cautions 1. When the subsystem clock oscillator is used, the following should be noted concerning wiring
Crystal resonator
External clock
Resonator
2. This is the time required for oscillation to stabilize after power (V
2. The subsystem clock oscillator is a low-amplitude circuit in order to achieve a low consumption
in the area in the figure enclosed by broken lines to prevent the influence of wiring capacitance,
etc.
• The wiring should be kept as short as possible.
• No other signal lines should be crossed.
• Keep away from lines carrying a high fluctuating current.
• The oscillator capacitor grounding point should always be at the same potential as V
• Do not connect to a ground pattern carrying a high current.
• A signal should not be taken from the oscillator.
current, and is more prone to misoperation due to noise than the main system clock oscillator.
Particular care is therefore required with the wiring method when the subsystem clock is used.
V
Recommended
PP
XT2
C4
R1
XT2
Circuit
C3
XT1
XT1
Oscillation frequency
(f
Oscillation stabilization
time
XT1 input frequency
(f
XT1 input
high-/low-level
width (t
XT
XT
)
)
Note 1
Note 1
Note 2
Parameter
XTH
/t
XTL
A
)
= –40 to +85 C, V
V
DD
= 4.5 to 6.0 V
Test Conditions
DD
= 2.7 to 6.0 V)
DD
) is turned on.
MIN. TYP. MAX. Unit
32 32.768
32
5
1.2
PD78P058F
100
35
10
15
2
SS
kHz
kHz
s
.
s
33