7480 datasheet(229/337 Pages) RENESAS

229 / 337 page

7480 Group and 7481 Group User's Manual

2-14

APPLICATIONS

2.2 Timer X and Timer Y

2.2.6 Application Example of Programmable Waveform Generation Mode

Control of Motorcycle Single-Cylinder Engine

POINT: A trigger input to the INT pin automatically starts a timer counting. This allows the CNTR pin

output to be changed with a more accurate timing than counting is started in an INT interrupt

service routine.

SPECIFICATIONS:

Clock: f(XIN) = 8 MHz

A rise-to-rise period of a crank angle signal input to the CNTR0 pin is measured

using the pulse period measurement mode of timer X to determine the correction

value of timer Y.

The trigger of the crank angle signal input to the INT1 pin makes timer Y

activated. Then, the control signal of the igniter is output from the CNTR1 pin

using the programmable waveform generation mode.

For the pulse period measurement of the crank angle signal, refer to Section 2.2.4 Application

Example of Pulse Period Measurement Mode.

Figure 2.2.14 shows a peripheral circuit example.

Figure 2.2.15 shows an operation timing example.

Figure 2.2.16 shows a control procedure example of motorcycle engine.

Figure 2.2.15 Operation Timing Example

INT1 pin input

CNTR0 pin input

(Crank angle signal)

CNTR1 pin output

(Igniter control signal)

000016

Initial

value

Timer Y

output

level latch

TL0

TL1

: Measured with pulse period measurement mode of timer X

: The written value to timer Y to correct HIGH output time of

the CNTR1 pin (determined by measured value T).

: The written value to timer Y to output LOW time of the CNTR1 pin

(determined by measured value T).

Timer Y activated

: Underflow

: Reload

TL0 set 1

TL1set 2

Count stop 5

Initial value set 6

Figure 2.2.14 Peripheral Circuit Example

7480 Group

7481 Group

P31/INT1

P40/CNTR0

Phase control signal

Igniter

Motorcycle single-cylinder engine

P41/CNTR1

Crank angle input

7480 Datasheet(PDF) 229 Page - Renesas Technology Corp

7480 Datasheet(HTML) 229 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

Datasheet Download

Link URL