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TS68230 データシート(PDF) 45 Page - STMicroelectronics |
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TS68230 データシート(HTML) 45 Page - STMicroelectronics |
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45 / 61 page  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. 76 5 4 32 1 0 Timer Enable TOUT/TIACK Control * Z.D Control Clock Control 0 1 x 0 0 00 or 1X Changed * Analog representation of counter value. TS68230 45/61 |
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