Fujitsu FR81S User Manual
CHAPTER 19: BASE TIMER
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: BASE TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
62
⋅
If reactivation is not permitted (RTGEN = 0): Any activation trigger is ignored when it is entered during
counting.
⋅
If reactivation is permitted (RTGEN = 1): The TGIR bit of the base timer x status control register
(BTxSTC) changes to "1". In addition, the value set in the
base timer x cycle setting register (BTxPCSR) is reloaded to
the 16-bit down counter, which begins counting.
These operations are shown below.
Figure 5-13 Counting Operation
Note:
If the count timing of the 16-bit down counter and the load timing occur at the same time, the load operation is
given precedence.
m
n
0
(1)
=
T
(
n
+
1
)
ms
(2)
=
T
(
m
+
1
)
ms
m
:
Value of base timer x cycle setting register (BTxPCSR)
n
:
Value of base timer x duty setting register (BTxPDUT)
T
:
Cycle of count clock
m
n
0
Counting operation when reactivation is not enabled
Rising edge detection
Activation trigger is ignored
(1)
(2)
Activation trigger
PWM output waveform
Counting operation when reactivation is enabled
Rising edge detection
Reactivate with trigger
PWM output waveform
(1)
(2)
(1)
=
T
(
n
+
1
)
ms
(2)
=
T
(
m
+
1
)
ms
m
:
Value of base timer x cycle setting register (BTxPCSR)
n
:
Value of base timer x duty setting register (BTxPDUT)
T
:
Cycle of count clock
Activation trigger
MB91520 Series
MN705-00010-1v0-E
695