7540 datasheet(133/366 Pages) RENESAS

133 / 366 page

2-57

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPLICATION

2.4 Timer X

Fig. 2.4.22 Example of control procedure

“FF16”

Flow rate measuring routine

“C716”

“F916”

END

Timer Y interrupt processing routine

(Prescaler X setting value “FF16” Timer X setting

value “FF16”) – (Prescaler X count value, Timer X

count value)

← The numbeer of event within 100 ms

RTI

TXM(Address 2B16)

TCSS(Address 2E16)

Timer Y count source:

f(XIN)/16 selected

Timer Y

division

ratio

Timer Y

primary

setting

value

Event counter mode

Count at falling edge

Timer X count stop

Set timer X mode register

Set port P14 to the input mode.

Set “0” to the CNTR0 interrupt enable bit.

(CNTR0 interrupt disabled)

Set “0” to the timer X interrupt enable bit.

(Timer X interrupt disabled)

Set “0” to the timer Y interrupt enable bit.

(Timer Y interrupt disabled)

Note : 100 ms = 1/8 MHz ✕ 16 ✕ (C716 + 1) ✕ (F916 + 1)

Prescaler X (Address 2C16)

Set value to timer X

Timer X (Address 2D16)

Set timer count source set register

Prescaler Y

setting

value

TYZM(Address 2016)

Set timer Y, Z mode register

Timer mode

Writing to latch and timer

simultaneously

Timer Y count stop

Set value to timer Y (Note)

Prescaler Y (Address 2116)

Timer Y primary (Address 2316)

Set “1” to the timer Y interrupt enable bit.

(Timer Y interrupt enabled)

Set “0” to the timer Y interrupt request bit.

TXM(Address 2B16)

Timer X count start

Set timer X mode register

TYZM(Address 2016)

Set timer Y, Z mode register

Timer Y count start

TXM(Address 2B16)

Timer X count stop

Set timer X mode register

TYZM(Address 2016)

Set timer Y, Z mode register

Timer Y count stop

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