upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 501

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

Electrical
specifications
(standard
products, (A)
grade
products),
Electrical
specifications
((A1) grade
products)
Recommended
soldering
conditions
Wait
Function
Subsystem
clock
oscillator
Details of
Function
When using the subsystem 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
• Always make the ground point of the oscillator capacitor the same potential as
• Do not ground the capacitor to a ground pattern through which a high current
• Do not fetch signals from the oscillator.
The subsystem clock oscillator is designed as a low-amplitude circuit for
reducing power 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.
Do not use different soldering methods together (except for partial heating).
When the CPU is operating on the subsystem clock and the high-speed system
clock is stopped (MCC = 1), do not access the registers listed above using an
access method in which a wait request is issued.
current flows.
V
flows.
SS
.
APPENDIX D LIST OF CAUTIONS
User’s Manual U16961EJ4V0UD
Cautions
pp. 427,
444
pp. 427,
444
p. 458
p. 459
Page
(26/26)
501