Fujitsu FR81S User Manual

Page of 2342
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)
8000
Doun count value
(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)
(12)down count
(10)match
8008
Buffer
(duty value)
(14)clear
 
 
MB91520 Series
MN705-00010-1v0-E
587