Fujitsu FR81S User Manual
CHAPTER 17: PPG
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: PPG
FUJITSU SEMICONDUCTOR CONFIDENTIAL
46
5.4. One-shot Operation (Center Aligned Wave Form
Selected)
The One-shot operation (Center Aligned Wave Form selected) is explained.
During the one-shot operation, one-shot pulses are output at the PPG pin. If the PPG output waveform
selection bit (PCN:OWFS)="1" is selected (Center Aligned Wave Form), the output waveform is generated
by doubling the value of the PPG cycle setting register (PCSR) and the value of the PPG duty setting
register (PDUT).
Figure 5-4 Example of One-shot Operation (Center Aligned Wave Form Selected)
CNTE
Activation trigger
PCSR
8000
PDUT
0007
Buffer
(cycle value)
(cycle value)
8000
Doun count value
(PTMR)
(PTMR)
7FF8
(1)
(2)Writing
(3)
Enable PPG operation
(4)
(5)Load
(5)Load
(6)Down count
8008
7FF8
(7)match
(8)inverison
(11)clear
(13)borrow
(9)down count
duty X2
cycle X2
Normal polarity
Inverted polarity
PPG pin output
Interrupt factor
Valid edge
Duty match
Counter borrow
Buffer
(duty value end-point)
(duty value end-point)
(12)down count
(10)match
8008
Buffer
(duty value)
(duty value)
(14)clear
MB91520 Series
MN705-00010-1v0-E
587