TMP93CS41 datasheet(152/248 Pages) TOSHIBA

152 / 248 page

TMP93CS40/TMP93CS41

2004-02-10

93CS40-150

Figure 3.9.16 One-shot Pulse Output (without delay)

2. Frequency measurement

The frequency of the external clock can be measured in this mode. The clock signal 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 clock input of timer 4. The value of the up

counter is loaded into the capture register CAP1 at the rising edge of the timer flip-flop

TFF1 of the 8-bit timers (Timer 0 and timer 1). Similarly, the up counter value is loaded

into CAP2 at the falling edge of the TFF1 flip-flop.

The frequency is calculated by the difference between the values loaded in CAP1 and

CAP2, at the moment when an interrupt (INTT0 or INTT1) is generated by either 8-bit

timer.

Figure 3.9.17 Frequency Measurement

For example, if the value for the level “1” width of TFF1 of the 8-bit timer is set to 0.5 s

and the difference between CAP1 and CAP2 is 100, the frequency will be 100

÷ 0.5 s = 200

Hz.

Count clock

(Internal clock)

TI4 pin input

(External trigger pulse)

Match with TREG5

Timer output pin TO4

Enable inversion caused

by loading of the up

counter value into CAP1.

Disable inversion caused by loading of the

up counter value into CAP2.

INT4 occurrence. Load the up counter

value into capture register 1 (CAP1).

Load the up counter value into

capture register 2 (CAP2).

Enable

inversion

Pulse width

(p)

INTTR5

occurrence

+ p

TFF1

Loading UC4 into CAP1

Loading UC4 into CAP2

Count clock

(Internal clock)

INTT0/INTT1

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