CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U19014EJ1V0UD
98
Figure 5-13. Clock Generator Operation When Power Supply Voltage Is Turned On
When 2.7 V/1.59 V POC Mode Is Set (Option Byte: POCMODE = 1)
2.7 V (TYP.)
Internal high-speed
oscillation clock (f
RH
)
CPU clock
High-speed
system clock (f
XH
)
(when X1 oscillation
selected)
Internal reset signal
0 V
Power supply
voltage (V
DD
)
<1>
Internal high-speed
oscillation clock
High-speed system clock
Switched by
software
X1 clock
oscillation stabilization time:
2
11
/f
X
to 2
16
/f
X
Note
Starting X1 oscillation
is specified by software.
Waiting for oscillation
accuracy stabilization
<2>
<4>
<3>
Reset processing
(20 s (TYP.))
µ
<1> When the power is turned on, an internal reset signal is generated by the power-on-clear (POC) circuit.
<2> When the power supply voltage exceeds 2.7 V (TYP.), the reset is released and the internal high-speed
oscillator automatically starts oscillation.
<3> After the reset is released and reset processing is performed, the CPU starts operation on the internal high-
speed oscillation clock.
<4> Set the start of oscillation of the X1 clock via software (see
(1)
in
5.6.1 Example of controlling high-speed
system clock)
.
<5> When switching the CPU clock to the X1 clock, wait for the clock oscillation to stabilize, and then set
switching via software (see
(3)
in
5.6.1 Example of controlling high-speed system clock
).
Note
When releasing a reset (above figure) or releasing STOP mode while the CPU is operating on the internal
high-speed oscillation clock, confirm the oscillation stabilization time for the X1 clock using the oscillation
stabilization time counter status register (OSTC). If the CPU operates on the high-speed system clock (X1
oscillation), set the oscillation stabilization time when releasing STOP mode using the oscillation
stabilization time select register (OSTS).
Cautions 1. It is not necessary to wait for the oscillation stabilization time when an external clock input
from the EXCLK pin is used.
2.
For
the
µ
PD78F0730, be sure to set the 2.7 V/1.59 V POC mode by using the option byte
(POCMODE = 1).
Remark
While the microcontroller is operating, a clock that is not used as the CPU clock can be stopped via
software settings. The internal high-speed oscillation clock and high-speed system clock can be
stopped by executing the STOP instruction (see
(4)
in
5.6.1 Example of controlling high-speed
system clock
and
(3)
in
5.6.2 Example of controlling internal high-speed oscillation clock
).
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