Mitsubishi Electric M32170F3VFP, User Manual

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10
10-216 Ver.0.10
MULTIJUNCTION TIMERS
10.9 TOM (Output-related 16-bit Timer)
10.9.10 Operation in TOM PWM Output Mode
(1) Outline of TOM 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 TID2 underflow/overflow signal), 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 TOM's PWM output mode does not have the correction function.