APPENDIX D LIST OF CAUTIONS
User’s Manual U18172EJ2V0UD
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(10/15)
Chapter
Cl
assi
fi
cati
on
Function Details
of
Function
Cautions Page
Interrupt
requests are
held pending
Interrupt requests will be held pending while the interrupt request flag registers
(IF0) or interrupt mask flag registers (MK0) are being accessed.
p. 174
Chapter 10
Soft
Interrupt
functions
Interrupt
request pending
Multiple interrupts can be acknowledged even for low-priority interrupts.
p. 175
Soft
−
The LSRSTOP setting is valid only when “Can be stopped by software” is set for
the low-speed internal oscillator by the option byte.
p. 177
STOP mode
When shifting to the STOP mode, be sure to stop the peripheral hardware
operation before executing STOP instruction (except the peripheral hardware that
operates on the low-speed internal oscillation clock).
p. 178
STOP mode,
HALT mode
The following sequence is recommended for operating current reduction of the
A/D converter when the standby function is used: First clear bit 7 (ADCS) and bit
0 (ADCE) of the A/D converter mode register (ADM) to 0 to stop the A/D
conversion operation, and then execute the HALT or STOP instruction.
p. 178
Hard
STOP mode
If the low-speed internal oscillator is operating before the STOP mode is set,
oscillation of the low-speed internal oscillation clock cannot be stopped in the
STOP mode (refer to Table 11-1).
p. 178
Soft
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. 179
Hard
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 signal generation or
interrupt generation.
p. 179
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. 179
HALT mode
setting and
operating
statuses
Because an interrupt request signal is used to clear the standby mode, if there is
an interrupt source with the interrupt request flag set and the interrupt mask flag
clear, the standby mode is immediately cleared if set.
p. 180
Chapter 11
Soft
Standby
Function
STOP mode
setting and
operating
statuses
Because an interrupt request signal is used to clear the standby mode, if there is
an interrupt source with the interrupt request flag set and the interrupt mask flag
reset, the standby mode is immediately cleared if set. Thus, in the STOP mode,
the normal operation mode is restored after the STOP instruction is executed and
then the operation is stopped for 34
µ
s (TYP.) (after an additional wait time for
stabilizing the oscillation set by the oscillation stabilization time select register
(OSTS) has elapsed when crystal/ceramic oscillation is used).
p. 183