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3819 Group USER’S MANUAL

2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.2 Timer

2.2.2 Timer application examples

(1) Basic functions and uses

[

Function 1 ]

]

Control of Event interval (Timers 1 to 6)

The Timer count stop bit is set to “0” after setting a count value to a timer. Then a timer interrupt request

occurs after a certain period.

[

Use ]

]

• Generation of an output signal timing

• Generation of a waiting time

[

Function 2 ]

]

Control of Cyclic operation : Generation of synchronous timing (Timers 1 to 6)

The value of a timer latch is automatically written to a timer each time a timer underflows, and a timer

interrupt request occurs.

[

Use ]

]

• Generation of cyclic interrupts

• Clock function (measurement of one second) ¡ Application example 1

• Control of a main routine cycle

[

Function 3 ]

]

Output of Rectangular waveform (Timers 1 and 3)

The output level of the TOUT pin is inverted every time a timer underflows. To output long-interval rectangular

waveforms (when division of 8 bits or more is necessary), the Timers 2 and 3 are connected .

[

Use ]

]

• A piezoelectric buzzer output ¡ Application example 2

• Generation of the remote-control carrier waveforms

[

Function 4] Count of External pulse (Timers 2 and 4)

External pulses input to the CNTR pin are selected as a timer count source.

[

Use ]

]

• Measurement of frequency (judging if the Video synchronization signal exits) ¡ Application example 3

• Division of external pulses and generation of interrupts in a cycle based on an external pulse.

(count of a reel pulse)

[

Function 5 ]

]

Output of PWM signal (Timer 6)

The pulses with each specified intervals of “H” and “L” are output.

[

Use ]

]

• Control of an electronic volume (connected with VCA)

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