7477 datasheet(245/361 Pages) RENESAS

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2-19

7470/7471/7477/7478 GROUP USER’S MANUAL

APPLICATION

2.3 Timers

7470

7471

7477

7478

Fig. 2.3.9 Example of control procedure [Pulse width measurement mode]

,,,,

RTS

Pulse width measurement routine

Read Timer 4

(Timer 4 set value FF 16) – (Timer 4 read value)

← Input pulse “H” width measurement value

T Measurement completed

Set the Timer 34 mode register

!! !

!! ! 1

Timer 4 count stop

Set the Edge polarity selection register

0 !

!! 0 !

Select the measurement of CNTR 0 “H” width

Interrupt

← CNTR0 selected

Set the Timer 4 to “FF 16”

Clear the CNTR interrupt request bit

Set the Timer 34 mode register

1 !! 0

! T34M (Address 00F916)

Timer 4 count start

Set the Timer 34 mode register

1 !! 1

! T34M (Address 00F916)

Timer 4 count source

← select according to an input pulse

External pulse width

measurement mode selected

Set the Timer 34 mode register

1 !! 1

! T34M (Address 00F916)

Timer 4 count stop

CNTR interrupt request ?

T34M (Address 00F9 16)

EG (Address 00D4 16)

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