upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 474

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

474
Electrical
specifications
Recommended
soldering
conditions
Function
Absolute
maximum
ratings
X1 oscillator
Recommended
oscillator
constants
Details of
Function
−
Product quality may suffer if the absolute maximum rating is exceeded even
momentarily for any parameter. That is, the absolute maximum ratings are
rated values at which the product is on the verge of suffering physical damage,
and therefore the product must be used under conditions that ensure that the
absolute maximum ratings are not exceeded.
When using the X1 oscillator, wire as follows in the area enclosed by the
broken lines in the above figures 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
• Always make the ground point of the oscillator capacitor the same potential
• Do not ground the capacitor to a ground pattern through which a high current
• Do not fetch signals from the oscillator.
Since the CPU is started by the Ring-OSC after reset is released, check the
oscillation stabilization time of the X1 input clock using the oscillation
stabilization time counter status register (OSTC). Determine the oscillation
stabilization time of the OSTC register and oscillation stabilization time select
register (OSTS) after sufficiently evaluating the oscillation stabilization time
with the resonator to be used.
For the resonator selection of the
and oscillator constants, users are required to either evaluate the oscillation
themselves or apply to the resonator manufacturer for evaluation.
The oscillator constants shown above are reference values based on
evaluation in a specific environment by the resonator manufacturer. If it is
necessary to optimize the oscillator characteristics in the actual application,
apply to the resonator manufacturer for evaluation on the implementation
circuit. The oscillation voltage and oscillation frequency only indicate the
oscillator characteristic. Use the 78K0/KB1 so that the internal operation
conditions are within the specifications of the DC and AC characteristics.
Do not use different soldering methods together (except for partial heating).
current flows.
as V
flows.
APPENDIX D LIST OF CAUTIONS
SS
.
User’s Manual U15836EJ5V0UD
µ
Cautions
PD780101(A), 780102(A), and 780103(A)
pp.371,
389, 405,
420
pp.372,
390, 407,
421
pp.372,
390, 407,
421
pp.373,
391
pp.373,
374, 375,
391, 392,
393
pp.431,
432
(20/20)
Page