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3819 Scheda tecnica(PDF) 97 Page - Renesas Technology Corp

Il numero della parte 3819
Spiegazioni elettronici  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  218 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

3819 Scheda tecnica(HTML) 97 Page - Renesas Technology Corp

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83
2. APPLICATION
MITSUBISHI MICROCOMPUTER
3819 Group
2.2 Timer
3819 Group USER’S MANUAL
*
(4) Timer application example 3 : Measurement of frequency
(judging if Video synchronization signal exists)
Outline : The pulses input to the External count input pin (CNTR) are counted by a timer to judge if the
frequency is within a certain range.
Specifications : • The Video synchronization signal is input to the CNTR1 pin and counted by the Timer 4.
• A count value is read out at the interval of about 2 ms (Timer 1 interrupt interval : 244
µs !
8). When the count value is 28 to 40, it is regarded as the existence of the Video synchro-
nization signal.
• Because the timer is a down-counter, the count value is compared with 227 to 215.
227 to 215 = 255 (initialized value of counter) – 28 to 40 (the number of valid value).
Figure 2.2.19 shows a method for judging if Video synchronization signal exists, and Figure 2.2.20 shows a setting
of related registers.
*
Fig 2.2.19 A method for judging if Video synchronization signal exists
Video synchronization signal
63.5
µs
(15.7 kHz)
244
µs ! 8
63.5
µs
= 31 counts



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