Fujitsu FR81S User Manual
CHAPTER 20: RELOAD TIMER
6. Application Note
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : RELOAD TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
FUJITSU SEMICONDUCTOR CONFIDENTIAL
60
6.3. PPG
PPG is shown below.
PPG is the feature which generates an output pulse by configuring L width/H width of the pulse. An
activation trigger launches a load from TMRLRA to the counter and the operation switches to load the
value from TMRLRB and executes a down count when an underflow occurs.
activation trigger launches a load from TMRLRA to the counter and the operation switches to load the
value from TMRLRB and executes a down count when an underflow occurs.
When RELD=0, "Activation trigger => TMRLRA load => Down count=> Underflow => TMRLRB load
=> Down count => Underflow," then stops the down count.
=> Down count => Underflow," then stops the down count.
When RELD=1, counter is loaded with TMRLRA/TMRLRB alternatively and executes down count
whenever an underflow occurs, such as Activation trigger => TMRLRA load => Down count =>
Underflow => TMRLRB load => Down count => Underflow => TMRLRA load => Down count =>
Underflow => TMRLRB load and so on.
whenever an underflow occurs, such as Activation trigger => TMRLRA load => Down count =>
Underflow => TMRLRB load => Down count => Underflow => TMRLRA load => Down count =>
Underflow => TMRLRB load and so on.
The TOUT outputs the "L level" while counting until the occurrence of an underflow caused by the down
count from TMRLRA, and outputs the "H level" while counting until the occurrence of an underflow
caused by the down count from TMRLRB. When a retrigger occurs, TOUT output returns to its initial
value.
count from TMRLRA, and outputs the "H level" while counting until the occurrence of an underflow
caused by the down count from TMRLRB. When a retrigger occurs, TOUT output returns to its initial
value.
Note:
TOUT is not initialized in the one shot mode at retrigger.
MB91520 Series
MN705-00010-1v0-E
787