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7540 Datasheet(PDF) 95 Page - Renesas Technology Corp

Part # 7540
Description  8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES
PDF  366 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7540 Datasheet(HTML) 95 Page - Renesas Technology Corp

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2-19
REJ09B0018-0200Z
Rev.2.00
Jun 21, 2004
7540 Group
APPLICATION
2.2 Timer A
2.2.3 Timer mode
(1) Operation description
Timer A counts the oscillation frequency divided by 16. Each time the count clock is input, the
contents of Timer A is decremented by 1. When the contents of Timer A reach “000016”, an underflow
occurs at the next count clock, and the timer A latch is reloaded into Timer A. The division ratio of
Timer A is 1/(n+1) provided that the value of Timer A is n.
Timer A can stop counting by setting “1” to the timer A count stop bit.
Also, when Timer A underflows, the timer A interrupt request bit is set to “1”.
(2) Timer mode setting method
Figure 2.2.11 shows the setting method for timer mode of timer A.



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