M38049F8HKP datasheet(165/387 Pages) RENESAS

No. de pieza	M38049F8HKP

Descripción Electrónicos	8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

PDF	387 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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APPLICATION

2.3 Timer

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

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

Outline: The timer Z counts the “H” level width of the pulses input to the P47/CNTR2 pin. An underflow

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

the P47/CNTR2 interrupt.

Specifications: •The timer Z counts the “H” level width of the FG pulse input to the P47/CNTR2 pin.

When the clock frequency is 8 MHz, the count source is 2

µs, which is obtained by dividing the

clock frequency by 16. Measurement can be made up to 131.072 ms in the range of FFFF16 to

000016.

Figure 2.3.25 shows the timers connection and setting of division ratio; Figure 2.3.26 shows the

relevant registers setting; Figure 2.3.27 and Figure 2.3.28 show the control procedure.

Fig. 2.3.25 Timers connection and setting of division ratios

131.072 ms

1/161/65536

f(XIN) = 8 MHz

Timer Z count source

selection bit

Timer Z

Timer Z interrupt

request bit

0 : No interrupt request issued

1 : Interrupt request issued

0 or 1

M38049F8HKP Datasheet(PDF) 165 Page - Renesas Technology Corp