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EM78P372KSS20 Datasheet(PDF) 83 Page - ELAN Microelectronics Corp |
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EM78P372KSS20 Datasheet(HTML) 83 Page - ELAN Microelectronics Corp |
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83 / 118 page ![]() EM78P372K 8-bit Microcontroller Product Specification (V1.4) 05.11.2016 75 (This specification is subject to change without prior notice) 7.11.2 Crystal Oscillator/Ceramic Resonators (Crystal) The EM78P372K can be driven by an external clock signal through the OSCI pin as illustrated below. OSCI OSCO Figure 7-30 External Clock Input Circuit In most applications, Pin OSCI and Pin OSCO can be connected with a crystal or ceramic resonator to generate oscillation. Figure 6-18 below depicts such a circuit. The same applies to the XT mode, HXT1 mode, HTX2 mode, LXT1 mode and LXT2 mode. OSCI OSCO Crystal RS C2 C1 Figure 7-31 Crystal/Resonator Circuit The following table provides the recommended values for C1 and C2. Since each resonator has its own attribute, user should refer to the resonator specifications for the appropriate values of C1 and C2. RS, a serial resistor, maybe required for AT strip cut crystal or low frequency mode. Figure 6-21 is PCB layout suggestion. When the system works in Crystal mode (16 MHz), a 10 K is connected between OSCI and OSCO. |
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