upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 479
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upd78f0114hgb-8es-a
Manufacturer Part Number
upd78f0114hgb-8es-a
Description
8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0114HGB-8ES-A.pdf
(505 pages)
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Part Number:
UPD78F0114HGB-8ES-A
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High-
speed
System
Clock
Oscillator,
Subsyste
m Clock
Oscillator
Prescaler
Internal
Oscillator
CPU
Clock
Function
Details of
Function
When using the high-speed system clock oscillator and subsystem clock
oscillator, wire as follows in the area enclosed by the broken lines in Figures 5-8 to
5-10 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 fetch signals from the oscillator.
Note that the subsystem clock oscillator is designed as a low-amplitude circuit for
reducing power consumption.
When the internal oscillation clock is selected as the clock supplied to the CPU,
the prescaler generates various clocks by dividing the internal oscillator output (f
= 240 kHz (TYP.)).
The RSTOP setting is valid only when “Can be stopped by software” is set for
internal oscillator by the option byte.
To calculate the maximum time, set f
Selection of the CPU clock cycle division factor (PCC0 to PCC2) and switchover
from the high-speed system clock to the subsystem clock (changing CSS from 0
to 1) should not be set simultaneously.
Simultaneous setting is possible, however, for selection of the CPU clock cycle
division factor (PCC0 to PCC2) and switchover from the subsystem clock to the
high-speed system clock (changing CSS from 1 to 0).
Setting the following values is prohibited when the CPU operates on the internal
oscillation clock.
• CSS, PCC2, PCC1, PCC0 = 0, 0, 1, 0
• CSS, PCC2, PCC1, PCC0 = 0, 0, 1, 1
• CSS, PCC2, PCC1, PCC0 = 0, 1, 0, 0
current flows.
V
current flows.
SS
. Do not ground the capacitor to a ground pattern through which a high
APPENDIX D LIST OF CAUTIONS
User’s Manual U16961EJ4V0UD
Cautions
R
= 120 kHz.
X
p. 106
p. 110
p. 117
p. 118
p. 119
p. 119
Page
(4/26)
479
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