M38K09RFS datasheet(165/328 Pages) RENESAS

tên linh kiện	M38K09RFS

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2.3 Timer

Rev.2.00

Oct 05, 2006

page 36 of 111

38K0 Group

REJ09B0337-0200

APPLICATION

(5)

Timer application example 4: Measurement of FG pulse width for motor

Outline: The timer X counts the “H” level width of the pulses input to the P51/CNTR0 pin. An

underflow is detected by the timer X interrupt and an end of the input pulse “H” level is

detected by the CNTR0 interrupt.

Specifications: •The timer X counts the “H” level width of the FG pulse input to the P51/CNTR0 pin.

When the clock frequency is 6 MHz, the count source is 2.67

µs, which is obtained by dividing the

clock frequency by 16. Measurement can be performed to 175 ms in the range of FFFF16 to 000016.

Figure 2.3.20 shows the timers connection and setting of division ratio; Figure 2.3.21 shows the

related registers setting; Figure 2.3.22 shows the control procedure.

Fig. 2.3.20 Timers connection and setting of division ratios

175 ms

1/16

1/256

f(XIN) = 6 MHz

Fixed

Prescaler X

Timer X

Timer X interrupt

request bit

0 : No interrupt request issued

1 : Interrupt request issued

0 or 1

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