TMP93CS44 datasheet(118/224 Pages) TOSHIBA

118 / 224 page

TMP93CS44/S45

2004-02-10

93CS44-116

(4) Application examples of capture function

Used capture function, they can be applied in many ways, for example:

1. One-shot pulse output from external trigger pulse

2. Frequency measurement

3. Pulse width measurement

4. Time difference measurement

1. One-shot pulse output from external trigger pulse

Set to T4MOD<CAP12M1:0>

= 01.

Set the up counter UC4 in free-running mode with the internal input clock,

input the external trigger pulse from TI4 pin, and load the value of up counter into

capture register CAP1 at the rise edge of the TI4 pin.

When the interrupt INT4 is generated at the rise edge of TI4 input, set the

CAP1 value (c) plus a delay time (d) to TREG4 (

= c + d), and set the above set value

+ d) plus a one-shot pulse width (p) to TREG5 (= c + d + p). When the interrupt

INT4 occurs the T4FFCR<EQ5T4, EQ4T4>register should be set “11” and that the

TFF4 inversion is enabled only when the up counter value matches TREG4 or

TREG5. When interrupt INTTR5 occurs, this inversion will be disabled after

one-shot pulse is output.

The (c), (d) and (p) correspond to c, d and p in Figure 3.8.13.

Figure 3.8.13 One-shot Pulse Output (with Delay)

TI4 pin input

(External trigger pulse)

+ d + p

Load the up counter value into capture

Match with TREG5

Timer output pin TO4

Delay time

(d)

Match with TREG4

+ d

Pulse width

(p)

Inversion

enable

Disables inversion

caused by loading

of the up counter

value into CAP1.

Inversion

enable

INTTR5 occurred

Count clock

(Internal clock)

Set the counter in free-running mode.

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