m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 91

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
2.2.2 Timer application examples
[ [ [ [ [ Function 1 ] ] ] ] ] Control of Event interval (Timers 1 to 6)
[ [ [ [ [ Use ] ] ] ] ] • Generation of an output signal timing
[ [ [ [ [ Function 2 ] ] ] ] ] Control of Cyclic operation : Generation of synchronous timing (Timers 1 to 6)
[ [ [ [ [ Use ] ] ] ] ] • Generation of cyclic interrupts
[ [ [ [ [ Function 3 ] ] ] ] ] Output of Rectangular waveform (Timers 1 and 3)
[ [ [ [ [ Use ] ] ] ] ] • A piezoelectric buzzer output
[ [ [ [ [ Function 4] Count of External pulse (Timers 2 and 4)
[ [ [ [ [ Use ] ] ] ] ] • Measurement of frequency (judging if the Video synchronization signal exits)
[ [ [ [ [ Function 5 ] ] ] ] ] Output of PWM signal (Timer 6)
[ [ [ [ [ Use ] ] ] ] ] • Control of an electronic volume (connected with VCA)
(1) Basic functions and uses
• Generation of a waiting time
The value of a timer latch is automatically written to a timer each time a timer underflows, and a timer
interrupt request occurs.
• Clock function (measurement of one second)
• Control of a main routine cycle
The output level of the T
waveforms (when division of 8 bits or more is necessary), the Timers 2 and 3 are connected .
• Generation of the remote-control carrier waveforms
External pulses input to the CNTR pin are selected as a timer count source.
• Division of external pulses and generation of interrupts in a cycle based on an external pulse.
The pulses with each specified intervals of “H” and “L” are output.
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.
(count of a reel pulse)
OUT
pin is inverted every time a timer underflows. To output long-interval rectangular
Application example 2
3819 Group USER’S MANUAL
Application example 1
MITSUBISHI MICROCOMPUTER
Application example 3
3819 Group
2.2 Timer
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