TS68230 datasheet(45/61 Pages) STMICROELECTRONICS

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Figure 5.2 : Square Wave Generator Example.

5.2.3. INTERRUPT AFTER TIMEOUT.

In this configuration the timer generates an interrupt

after a programmed time period has expired. The

TOUT pin is connected to the system’s interrupt re-

quest circuitry and the TIACK pin may be an inter-

rupt acknowledge input to the timer. The TIN pin

may be used as a clock input.

This configuration is similar to the periodic interrupt

generator except that the zero detect control bit is set.

This forces the counter to roll over after zero detect is

reached, rather than reloading from the CPRs. When

the processor takes the interrupt it can halt the timer,

read the counter and calculate the time from the inter-

rupt request to entering the service routine. Accurate

knowledge of the interrupt latency may be useful in

some applications (see figure 5.3).

Figure 5.1 :Periodic Interrupt Generator Example.

Timer

Enable

TOUT/TIACK

Control

Z.D

Control

Clock

Control

00 or 1X Changed

* Analog representation of counter value.

TS68230

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TS68230 bảng dữ liệu(PDF) 45 Page - STMicroelectronics