TS68230 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TS68230

HMOS PARALLEL INTERFACE/TIMER

STMicroelectronics 

Figure 5.1 :Periodic Interrupt Generator Example.

TS68230

* Analog representation of counter value.

Figure 5.2 : Square Wave Generator Example.

5.2.3. INTERRUPT AFTER TIMEOUT.

76 5 4 32 1 0

TOUT/TIACK

Control

Z.D

Control

*

Clock

Control

Timer

Enable

0 1 x 0 0 00 or 1X Changed

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).

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