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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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C167CS-L датащи(PDF) 62 Page - Infineon Technologies AG |
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C167CS-L датащи(HTML) 62 Page - Infineon Technologies AG |
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62 / 81 page  C167CS-4R C167CS-L Data Sheet 58 V2.2, 2001-08 Direct Drive When direct drive is configured (CLKCFG = 011B) the on-chip phase locked loop is disabled and the CPU clock is directly driven from the internal oscillator with the input clock signal. The frequency of fCPU directly follows the frequency of fOSC so the high and low time of fCPU (i.e. the duration of an individual TCL) is defined by the duty cycle of the input clock fOSC. The timings listed below that refer to TCLs therefore must be calculated using the minimum TCL that is possible under the respective circumstances. This minimum value can be calculated via the following formula: TCLmin = 1/fOSC × DCmin (DC = duty cycle) For two consecutive TCLs the deviation caused by the duty cycle of fOSC is compensated so the duration of 2TCL is always 1/ fOSC. The minimum value TCLmin therefore has to be used only once for timings that require an odd number of TCLs (1, 3, …). Timings that require an even number of TCLs (2, 4, …) may use the formula 2TCL = 1/ fOSC. |
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