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3850 Folha de dados(PDF) 91 Page - Renesas Technology Corp

Nome de Peças 3850
Descrição Electrónicos  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  261 Pages
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
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3850 Folha de dados(HTML) 91 Page - Renesas Technology Corp

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2-22
3850/3851 Group User’s Manual
APPLICATION
2.2 Timer
(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 P27/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 P27/CNTR0 pin.
<Example>
When the clock frequency is 4.19 MHz, the count source is 3.8
µs, which is obtained by dividing
the clock frequency by 16. Measurement can be made up to 250 ms in the range of FFFF16 to
000016.
Figure 2.2.21 shows the timers connection and setting of division ratio; Figure 2.2.22 shows the
relevant registers setting; Figure 2.2.23 shows the control procedure.
Fig. 2.2.21 Timers connection and setting of division ratios
250 ms
1/16
1/256
1/256
f(XIN) = 4.19 MHz
Timer X count source
selection bit
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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