M38B53M4-059FP datasheet(107/355 Pages) MITSUBISHI

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38B5 Group User’s Manual

APPLICATION

2-19

2.2 Timer

2.2.3 Timer application examples

(1)

Basic functions and uses

[Function 1] Control of event interval (Timer 1 to Timer 6, Timer X: timer mode)

When a certain time, by setting a count value to each timer, has passed, the timer interrupt request occurs.

<Use>

•Generating of an output signal timing

•Generating of a wait time

[Function 2] Control of cyclic operation (Timer 1 to Timer 6, Timer X: timer mode)

The value of the timer latch is automatically written to the corresponding timer each time the timer

underflows, and each timer interrupt request occurs in cycles.

<Use>

•Generating of cyclic interrupts

•Clock function (measurement of 1 s); see “(2) Timer application example 1”

•Control of a main routine cycle

[Function 3] Output of rectangular waveform

(Timer 1, Timer 3, Timer 6, Timer X: pulse output mode)

The output level of the T1OUT pin, T3OUT pin, PWM1 pin or CNTR2 pin is inverted each time the timer

underflows.

<Use>

•Piezoelectric buzzer output; see “(3) Timer application example 2”

•Generating of the remote control carrier waveforms

[Function 4] Count of external pulses (Timer 2, Timer 4, Timer X: event counter mode)

External pulses input to the CNTR0 pin, CNTR1 pin, CNTR2 pin are counted as the timer count

source (in the event counter mode).

<Use>

•Frequency measurement; see “(4) Timer application example 3”

•Division of external pulses

•Generating of interrupts due to a cycle using external pulses as the count source; count of a reel pulse

[Function 5] Output of PWM signal (Timer 6)

“H” interval and “L” interval are specified, respectively, and the output of pulses from P44/PWM1

pin is repeated.

<Use>

•Control of electric volume

[Function 6] Measurement of external pulse width (Timer X: pulse width measurement mode)

The “H” or “L” level width of external pulses input to CNTR2 pin is measured.

<Use>

•Measurement of external pulse frequency (measurement of pulse width of FG pulse

V for a motor);

see “(5) Timer application example 4”

•Measurement of external pulse duty (when the frequency is fixed)

FG pulseV: Pulse used for detecting the motor speed to control the motor speed.

[Function 7] Control of real time port (Timer X: real time port function)

The data for real time is output from the P85 pin or P86 pin each time the timer underflows.

<Use>

•Stepping motor control; see “(6) Timer application example 5”

M38B53M4-059FP Datasheet(PDF) 107 Page - Mitsubishi Electric Semiconductor

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