M38047FEHKP datasheet(156/387 Pages) RENESAS

156 / 387 page

2-32

APPLICATION

2.3 Timer

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

[Function 7] One-shot pulse output by external trigger (Timer Z)

The value of timer latch is set to timer by trigger signal which is input from the INT pin, and timer

is counted down. When trigger signal is input, “H” or “L” is output from the CNTR pin at the same

time, and “L” or “H” is output by underflow of timer. (programmable one-shot generating mode)

2.3.3 Timer application examples

(1) Basic functions and uses

[Function 1] Control of Event interval (Timer X, Timer Y, Timer Z, Timer 1, Timer 2)

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

occurs.

<Use>

•Generation of an output signal timing

•Generation of a wait time

[Function 2] Control of Cyclic operation (Timer X, Timer Y, Timer Z, Timer 1, Timer 2)

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>

•Generation of cyclic interrupts

•Clock function (measurement of 250 ms); see Application example 1

•Control of a main routine cycle

[Function 3] Output of Rectangular waveform (Timer X, Timer Y, Timer Z)

The output level of the CNTR pin is inverted each time the timer underflows (in the pulse output

mode).

<Use>

•Piezoelectric buzzer output; see Application example 2

•Generation of the remote control carrier waveforms

[Function 4] Count of External pulses (Timer X, Timer Y, Timer Z)

External pulses input to the CNTR pin are counted as the timer count source (in the event counter

mode).

<Use>

•Frequency measurement; see Application example 3

•Division of external pulses

•Generation of interrupts due to a cycle using external pulses as the count source; count of a

reel pulse

[Function 5] Measurement of External pulse width (Timer X, Timer Y, Timer Z)

The “H” or “L” level width of external pulses input to CNTR pin is measured (in the pulse width

measurement mode).

<Use>

•Measurement of external pulse frequency (measurement of pulse width of FG pulse✽ for a

motor); see Application example 4

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

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

[Function 6] Output of Arbitrary waveform (Timer Z)

The value which is set to the output level latch is output from the CNTR pin each time the timer

underflows. (programmable waveform generating mode)

M38047FEHKP 数据表(PDF) 156 Page - Renesas Technology Corp

M38047FEHKP 数据表(HTML) 156 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

M38047FEHKP 数据表(PDF) 156 Page - Renesas Technology Corp

M38047FEHKP 数据表(HTML) 156 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载