APPENDIX D LIST OF CAUTIONS
User’s Manual U18172EJ2V0UD
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(2/15)
Chapter
Cl
assi
fi
cati
on
Function Details
of
Function
Cautions Page
To set and then release the STOP mode, set the oscillation stabilization time as
follows.
Expected oscillation stabilization time of resonator
≤
Oscillation stabilization time
set by OSTS
p. 69
The wait time after the STOP mode is released does not include the time from the
release of the STOP mode to the start of clock oscillation (“a” in the figure below),
regardless of whether STOP mode was released by reset input or interrupt
generation.
p. 69
Soft
Main clock OSTS:
Oscillation
stabilization
time select
register
The oscillation stabilization time that elapses on power application or after release
of reset is selected by the option byte. For details, refer to CHAPTER 15
OPTION BYTE.
p. 69
Chapter 5
Hard
Crystal/
ceramic
oscillator
−
When using the crystal/ceramic oscillator, wire as follows in the area enclosed by
the broken lines in Figure 5-6 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 current flows.
• Always make the ground point of the oscillator capacitor the same potential
as V
SS
. Do not ground the capacitor to a ground pattern through which a high
current flows.
• Do not fetch signals from the oscillator.
p. 70
Even if TM00 is read, the value is not captured by CR010.
pp. 83,
115
Hard
TM00: 16-bit
timer counter
00
When TM00 is read, count misses do not occur, since the input of the count clock
is temporarily stopped and then resumed after the read.
pp. 83,
115
Set CR000 to other than 0000H in the clear & start mode entered on match
between TM00 and CR000. This means a 1-pulse count operation cannot be
performed when this register is used as an external event counter. However, in
the free-running mode and in the clear & start mode using the valid edge of the
TI000 pin, if CR000 is set to 0000H, an interrupt request (INTTM000) is generated
when CR000 changes from 0000H to 0001H following overflow (FFFFH).
pp. 84,
115
If the new value of CR000 is less than the value of 16-bit timer counter 0 (TM00),
TM00 continues counting, overflows, and then starts counting from 0 again. If the
new value of CR000 is less than the old value, therefore, the timer must be reset
to be restarted after the value of CR000 is changed.
p.84,
115
Soft
The value of CR000 after 16-bit timer/event counter 00 has stopped is not
guaranteed.
pp. 84,
116
The capture operation may not be performed for CR000 set in compare mode
even if a capture trigger is input.
pp. 84,
118
Chapter 6
Hard
16-bit
timer/
event
counters
00
CR000: 16-bit
timer capture/
compare
register 000
When P21 is used as the input pin for the valid edge of TI010, it cannot be used
as a timer output (TO00). Moreover, when P21 is used as TO00, it cannot be
used as the input pin for the valid edge of TI010.
pp. 84,
120