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TMP96C141AF
Frequency Measurement
The frequency of the external clock can be measured
in this mode. The clock is input through the TI4 pin, and
its frequency is measured by the 8-bit timers (Timer 0 and
Timer 1) and the 16-bit timer/event counter (Timer 4).
The TI4 pin input should be selected for the input
clock of Timer 4. The value of the up-counter is loaded
For example, if the value for the level "1" width of
TFF1 of the 8-bit timer is set to 0.5 sec. and the differ-
100
Figure 3.9 (15). One-Shot Pulse Output (without Delay)
Figure 3.9 (16). Frequency Measurement
into the capture register CAP1 at the rise edge of the
timer flip-flop TFF1 of 8-bit timers (Timer 0 and Timer 1),
and into CAP2 at its fall edge.
The frequency is calculated by the difference
between the loaded values in CAP1 and CAP2 when the
interrupt (INTT0 or INTT1) is generated by either 8-bit
timer.
ence between CAP1 and CAP2 is 100, the frequency will
be 100/0.5 [sec.] = 200 [Hz].
TOSHIBA CORPORATION
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