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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TS68230 датащи(PDF) 46 Page - STMicroelectronics |
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TS68230 датащи(HTML) 46 Page - STMicroelectronics |
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46 / 61 page  Figure 5.3 : Single Interrupt after Timeout Example. 5.2.4. ELAPSED TIME MEASUREMENT EXAM- PLES. Elapsed time measurement takes several forms ; two forms are described in the following paragraphs. 5.2.4.1. System Clock Example. This configuration allows time interval measure- ment by software. The TIN pin may be used as an external timer enable if desired. The processor loads the counter preload registers (generally with all ones), loads the timer control re- gister, and then enables the timer. The counter is al- lowed to decrement until the ending event takes place. When it is desired to read the time interval, the processor must halt the timer and then read the counter. If TIN is used as an enable, the start and stop counter functions are controlled externally. For applications in which the interval may exceed the programmed time interval, zero detection can be counted by polling the status register or through in- terrupts to simulate additional timer bits. Note that the ZDS bit is latched and should be cleared after each detection of zero. At the end, the timer can be halted and read (see figure 5.4). 76 5 4 32 1 0 Timer Enable TOUT/TIACK Control * Z.D Control Clock Control 0 0 X 1 0 0 0 Changed Figure 5.4 : Elapsed Time Measurement Example. TS68230 46/61 |
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