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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92F124 датащи(PDF) 163 Page - STMicroelectronics |
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ST92F124 датащи(HTML) 163 Page - STMicroelectronics |
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163 / 426 page  163/426 STANDARD TIMER (STIM) 10.2 STANDARD TIMER (STIM) 10.2.1 Introduction The Standard Timer includes a programmable 16- bit down counter and an associated 8-bit prescaler with Single and Continuous counting modes capa- bility. The Standard Timer uses an output (STOUT) pin. This pin may be independent pin or connected as Alternate Function of an I/O port bit. STOUT can be used to generate a Square Wave or Pulse Width Modulated signal. The Standard Timer is composed of a 16-bit down counter with an 8-bit prescaler. The input clock to the prescaler can be driven either by an internal clock equal to INTCLK divided by 4, or by CLOCK2/1024 derived directly from the external oscillator, thus providing a stable time reference independent from the PLL programming (refer to Figure 90). The Standard Timer End Of Count condition is able to generate an interrupt which is connected to one of the external interrupt channels. The End of Count condition is defined as the Counter Underflow, whenever 00h is reached. Figure 90. Standard Timer Block Diagram n STOUT EXTERNAL INPUT & CLOCK CONTROL LOGIC INEN INMD1 INMD2 STP 8-BIT PRESCALER STH,STL 16-BIT STANDARD TIMER CLOCK OUTMD1 OUTMD2 OUTPUT CONTROL LOGIC INTERRUPT CONTROL LOGIC END OF COUNT INTS INTERRUPT REQUEST CLOCK2/ INTERRUPT DOWNCOUNTER INTCLK/4 MUX 1024 9 |
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