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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MC68HC705P9CS датащи(PDF) 103 Page - Freescale Semiconductor, Inc |
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MC68HC705P9CS датащи(HTML) 103 Page - Freescale Semiconductor, Inc |
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103 / 160 page  Timer Operation MC68HC705P9 — Rev. 4.0 Technical Data MOTOROLA Timer 103 9.4.1 Pin Functions The timer uses two pins. 9.4.1.1 PD7/TCAP PD7/TCAP is the input capture pin. When an active edge occurs on PD7/TCAP, the timer transfers the current counter value to the input capture registers. PD7/TCAP is also an I/O port pin. 9.4.1.2 TCMP TCMP is the output-only output compare pin. When the counter value matches the value written in the output compare registers, the timer transfers the output level bit, OLVL, to the TCMP pin. 9.4.2 Input Capture The input capture function is a means to record the time at which an external event occurs. When the input capture circuitry detects an active edge on the PD7/TCAP pin, it latches the contents of the timer registers into the input capture registers. The polarity of the active edge is programmable. Latching values into the input capture registers at successive edges of the same polarity measures the period of the input signal on the PD7/TCAP pin. Latching the counter values at successive edges of opposite polarity measures the pulse width of the signal. Figure 9-3 shows the logic of the input capture function. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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