Fujitsu FR81S User Manual
CHAPTER 48: WAVEFORM GENERATOR
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : WAVEFORM GENERATOR
FUJITSU SEMICONDUCTOR CONFIDENTIAL
42
Figure 5-11 When the "H" Interval of the Compare Output Is Short and a Reload Occurs
Before the Dead Timer Underflows
TMRR0
setting value
Count value of 16-bit
dead timer 0
Time
Compare output 1
RTO 0(U)
RTO 1(X)
Count value
Time
Compare value
RTO 0(U)
RTO 1(X)
RTO 0(U)
RTO 1(X)
RTO 0(U)
RTO 1(X)
t
Compare output change time
(time from dead timer activation
to its reactivation)
t
t
t
t
t
Load register value
of 16-bit dead timer
Load value for the time of
compare output change
When the compare output transition time is short and reload continues
before the dead timer underflows (the reload of the dead timer continues)
A setting of 16-bit dead timer register (TMRR) with a short compare output transition time that allows
continuous reloading before the dead timer underflows is prohibited.
In the case with the setting above in normal mode or inverted minus control mode, output of the X and U will
be fixed to "L". In the normal minus control mode or inverted mode, output of the U and X will be fixed to
"H".
In addition, when a reload occurs before the timer underflows while the dead timer is active, the interrupt
request flag bit of the 16-bit dead timer reload interrupt register (DTIR) will be set. If interrupts are enabled,
the interrupt will be notified.
MB91520 Series
MN705-00010-1v0-E
2087