APPENDIX D LIST OF CAUTIONS
User’s Manual U18172EJ2V0UD
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Chapter
Cl
assi
fi
cati
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Function Details
of
Function
Cautions Page
Hard
If the register read period and the input of the capture trigger conflict when CR000
is used as a capture register, the capture trigger input takes precedence and the
read data is undefined. Also, if the count stop of the timer and the input of the
capture trigger conflict, the capture trigger is undefined.
pp. 84,
117
CR000: 16-bit
timer capture/
compare
register 000
Changing the CR000 setting may cause a malfunction. To change the setting,
refer to 6.5 Cautions Related to 16-Bit Timer/Event Counter 00 (17) Changing
compare register during timer operation.
p. 84
In the free-running mode and in the clear & start mode using the valid edge of the
TI000 pin, if CR010 is set to 0000H, an interrupt request (INTTM010) is generated
when CR010 changes from 0000H to 0001H following overflow (FFFFH).
pp. 85,
115
If the new value of CR010 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 CR010 is less than the old value, therefore, the timer must be reset
to be restarted after the value of CR010 is changed.
pp. 85,
115
Soft
The value of CR010 after 16-bit timer/event counter 00 has stopped is not
guaranteed.
pp. 85,
116
Hard
The capture operation may not be performed for CR010 set in compare mode
even if a capture trigger is input.
pp. 85,
118
Hard
If the register read period and the input of the capture trigger conflict when CR010
is used as a capture register, the capture trigger input takes precedence and the
read data is undefined. Also, if the timer count stop and the input of the capture
trigger conflict, the capture data is undefined.
pp. 85,
117
CR010: 16-bit
capture/
compare
register 010
Changing the CR010 setting during TM00 operation may cause a malfunction. To
change the setting, refer to 6.5 Cautions Related to 16-Bit Timer/Event Counter
00 (17) Changing compare register during timer operation.
p. 86
16-bit timer counter 00 (TM00) starts operation at the moment TMC002 and
TMC003 (operation stop mode) are set to a value other than 0, 0, respectively.
Set TMC002 and TMC003 to 0, 0 to stop the operation.
pp. 86,
115
Soft
The timer operation must be stopped before writing to bits other than the OVF00
flag.
pp. 87,
116
Hard
If the timer is stopped, timer counts and timer interrupts do not occur, even if a
signal is input to the TI000/TI010 pins.
pp. 87,
115
Except when TI000 pin valid edge is selected as the count clock, stop the timer
operation before setting STOP mode or system clock stop mode; otherwise the
timer may malfunction when the system clock starts.
pp. 87,
120
Set the valid edge of the TI000 pin with bits 4 and 5 of prescaler mode register 00
(PRM00) after stopping the timer operation.
pp. 87,
116
If the clear & start mode entered on a match between TM00 and CR000, clear &
start mode at the valid edge of the TI000 pin, or free-running mode is selected,
when the set value of CR000 is FFFFH and the TM00 value changes from FFFFH
to 0000H, the OVF00 flag is set to 1.
p. 87
Even if the OVF00 flag is cleared before the next count clock is counted (before
TM00 becomes 0001H) after the occurrence of a TM00 overflow, the OVF00 flag
is re-set newly and clear is disabled.
pp. 87,
117
Chapter 6
Soft
16-bit
timer/
event
counters
00
TMC00: 16-bit
timer mode
control register
00
The capture operation is performed at the fall of the count clock. An interrupt
request input (INTTM0n0), however, occurs at the rise of the next count clock.
pp. 87,
118