Operation In Tio Pwm Output Mode - Mitsubishi Electric M32R Series User Manual

MULTIJUNCTION TIMERS
10
10.4 TIO (Input/Output-related 16-bit Timer)

10.4.11 Operation in TIO PWM Output Mode

(1) Outline of TIO PWM output mode
In PWM output mode, the timer uses two reload registers to generate a waveform with a given
duty cycle.
When after setting the initial values in reload 0 and reload 1 registers, the timer is enabled (by
writing to the enable bit in software or by external input), it loads the reload 0 register value into
the counter synchronously with the count clock letting the counter start counting down. The first
time the counter underflows, the reload 1 register value is loaded into the counter letting it
continue counting. Thereafter, the counter is reloaded with the reload 0 and reload 1 register
values alternately each time an underflow occurs. The valid count values are (reload 0 register
set value + 1) and (reload 1 register set value + 1). The timer stops at the same time count is
disabled by writing to the enable bit (and not in synchronism with PWM output period).
The F/F output waveform in PWM output mode is inverted (F/F output levels change from low to
high, or vice versa) at count startup and upon each underflow. An interrupt can be generated
when the counter underflows every other time (second time, fourth time, and so on) after being
enabled.
Note that TIO's PWM output mode does not have the correction function.
10-130 Ver.0.10