Fujitsu FR81S User Manual
CHAPTER 20: RELOAD TIMER
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : RELOAD TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
FUJITSU SEMICONDUCTOR CONFIDENTIAL
42
Figure 5-13 Compare One-shot Operation (1 / 2)
When the register relation is as described above, the TOUT output is the L level until TMR and TMRLRB match
after loading to the timer. When down counting from the comparison match (TMR = TMRLRB), the level is H until
the TOUT output is inverted and an underflow occurs. When an underflow occurs the TOUT output will be
initialized. Then, the timer will stop counting operation and turn into the activation trigger waiting state (for
OUTL="0").
after loading to the timer. When down counting from the comparison match (TMR = TMRLRB), the level is H until
the TOUT output is inverted and an underflow occurs. When an underflow occurs the TOUT output will be
initialized. Then, the timer will stop counting operation and turn into the activation trigger waiting state (for
OUTL="0").
When the register relation is as described above, the TOUT output is the H level between an activation trigger
generation and an underflow occurrence because TMR is already smaller than TMRLRB after loading to the
timer. When an underflow occurs, the timer will turn into the activation trigger waiting state and the TOUT output
will be the L level (for OUTL="0").
generation and an underflow occurrence because TMR is already smaller than TMRLRB after loading to the
timer. When an underflow occurs, the timer will turn into the activation trigger waiting state and the TOUT output
will be the L level (for OUTL="0").
• Sets TMRLRB < TMRLRA
TOUT
TOUT
Count clock
Count clock
Underflow
Underflow
UF bit
Reload
Activation trigger
Activation trigger
Counting from
Register reloaded
Register reloaded
TMRLRA + 1
count
count
Activation trigger waiting
Activation
Activation
TMRLRB
TMRLRA
TMRLRA
Compare one-shot function (TMRLRB < TMRLRA)
• Sets TMRLRB > TMRLRA
TMRLRA
TMRLRA
TMRLRA+1
TMRLRA+1
Compare one-shot function (TMRLRB > TMRLRA)
(for OUTL=0)
comparison match
by timer
by timer
(for OUTL=0)
trigger waiting
trigger waiting
MB91520 Series
MN705-00010-1v0-E
769