APPENDIX D LIST OF CAUTIONS
User’s Manual U16899EJ2V0UD
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(21/24)
Chapter
Cl
assi
fi
cati
on
Function Details
of
Function
Cautions Page
Hard
OSTC:
Oscillation
stabilization
time counter
status register
The wait time when STOP mode is released does not include the time after STOP
mode release until clock oscillation starts (“a” below) regardless of whether STOP
mode is released by RESET input or interrupt generation.
p. 378
To set the STOP mode when the high-speed system clock is used as the CPU
clock, set OSTS before executing a STOP instruction.
p. 379
Before setting OSTS, confirm with OSTC that the desired oscillation stabilization
time has elapsed
p. 379
Soft
If the STOP mode is entered and then released while the Ring-OSC clock is being
used as the CPU clock, set the oscillation stabilization time as follows.
•
Desired OSTC oscillation stabilization time
≤
Oscillation stabilization time set
by
OSTS
The oscillation stabilization time counter counts only during the oscillation
stabilization time set by OSTS. Therefore, note that only the statuses during the
oscillation stabilization time set by OSTS are set to OSTC after STOP mode has
been released.
p. 379
Hard
OSTS:
Oscillation
stabilization
time select
register
The wait time when STOP mode is released does not include the time after STOP
mode release until clock oscillation starts (“a” below) regardless of whether STOP
mode is released by RESET input or interrupt generation.
p. 379
Chapter 19
Soft
Standby
function
STOP mode
setting and
operation status
Because the interrupt request signal is used to release 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 released if set. Thus, the STOP mode is
reset to the HALT mode immediately after execution of the STOP instruction and
the system returns to the operating mode as soon as the wait time set using the
oscillation stabilization time select register (OSTS) has elapsed.
p. 385
For an external reset, input a low level for 10
µ
s or more to the RESET pin.
p. 389
During reset input, the high-speed system clock and Ring-OSC clock stop
oscillating.
p. 389
When the STOP mode is released by a reset, the STOP mode contents are held
during reset input. However, the port pins become high-impedance, except for
P130, which is set to low-level output.
p. 389
−
An LVI circuit internal reset does not reset the LVI circuit.
p. 390
Hard
Reset timing
due to
watchdog timer
overflow
A watchdog timer internal reset resets the watchdog timer.
p. 391
Chapter 20
Soft
Reset
function
RESF: Reset
control flag
register
Do not read data by a 1-bit memory manipulation instruction.
p. 396
Once bit 0 (CLME) is set to 1, it cannot be cleared to 0 except by RESET input or
the internal reset signal.
p. 398
Chapter 21
Soft
Clock
monitor
CLM: Clock
monitor mode
register
If the reset signal is generated by the clock monitor, CLME is cleared to 0 and bit
1 (CLMRF) of the reset control flag register (RESF) is set to 1.
p. 398