Operation Of Pwm Timer Functions - Fujitsu MB90335 Series Hardware Manual

MB90335 Series
13.3.1

Operation of PWM Timer Functions

The up count timer enables the reload and one-shot operations.
■ Operation of PWM Timer Functions
Performs the count up at every count clock after starting the timer. An interrupt request may occur when an
overflow occurs in the range between 0000
The following operation is executed due to the mode when an overflow occurs:
• One-shot mode: Stops Counting
• Reload mode: The contents of reload register is reloaded to the timer and the counting restarts.
Figure 13.3-1 shows the timer function operation in the one-shot and reload modes.
[One-shot mode]
Timer count value
FFFF
H
0000
H
Timer start
[Reload mode]
Timer count value
FFFF
H
PWCR
write value
0000
H
PWCR write Timer start
CM44-10137-6E
Figure 13.3-1 Operation of Timer Functions
Overflow
Write to PWCR
OVIR flag set/Timer stop
Overflow Overflow
Reload
Reload Reload Reload
Restart
FUJITSU MICROELECTRONICS LIMITED
and FFFF .
H H
(A solid line shows the timer count value.)
Overflow
(Restart disabled)
Timer start
OVIR flag set/Timer stop
Overflow Overflow Overflow
Reload
Reload Reload
OVIR flag set
CHAPTER 13 PWC TIMER
13.3 Movement of PWC Timer
Time
Timer stop
Time
301