7733 datasheet(126/940 Pages) RENESAS

номер детали	7733

подробное описание детали	16-BIT SINGLE-CHIP MICROCOMPUTER

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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.

Gate function selection bits

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