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7733 Folha de dados(PDF) 126 Page - Renesas Technology Corp

Nome de Peças 7733
Descrição Electrónicos  16-BIT SINGLE-CHIP MICROCOMPUTER
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
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7733 Folha de dados(HTML) 126 Page - Renesas Technology Corp

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TIMER A
7733 Group User’s Manual
6–15
6.3.4 Selectable functions
The gate and pulse output functions are described below.
(1) Gate function
The gate function is selected by setting the gate function selection bits (bits 4 and 3 at addresses 5616
to 5A16) to “102” or “112.” When the gate function is selected, counting can be started or stopped by
pin TAiIN’s input signal. Table 6.3.3 lists the count valid levels. Figure 6.3.5 shows an operation
example when the gate function is selected.
When selecting the gate function, set the port P5 and port P6 direction registers’ bits which correspond
to pin TAiIN for the input mode. Also make sure that pin TAiIN’s input signal has a pulse width equal
to or greater than two cycles of the count source.
Table 6.3.3 Count valid levels
6.3 Timer mode
Count valid level (Duration of counting)
While pin TAiIN’s input signal level is “L”
While pin TAiIN’s input signal level is “H”
Note: The counter does not count while pin TAiIN’s input signal is not at the count valid level.
b4
1
1
b3
0
1
Gate function selection bits



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