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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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P87LPC768FD датащи(PDF) 33 Page - NXP Semiconductors |
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P87LPC768FD датащи(HTML) 33 Page - NXP Semiconductors |
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33 / 64 page  Philips Semiconductors Preliminary data 87LPC768 Low power, low price, low pin count (20 pin) microcontroller with 4 kB OTP 8-bit A/D, Pulse Width Modulator 2001 Aug 06 31 SU01389 87LPC768 QUARTZ CRYSTAL OR CERAMIC RESONATOR X2 X1 THE OSCILLATOR MUST BE CONFIGURED IN ONE OF THE FOLLOWING MODES: – LOW FREQUENCY CRYSTAL – MEDIUM FREQUENCY CRYSTAL – HIGH FREQUENCY CRYSTAL * CAPACITOR VALUES MAY BE OPTIMIZED FOR DIFFERENT OSCILLATOR FREQUENCIES (SEE TEXT) A SERIES RESISTOR MAY BE REQUIRED IN ORDER TO LIMIT CRYSTAL DRIVE LEVELS. THIS IS PARTICULARLY IMPORTANT FOR LOW FREQUENCY CRYSTALS (SEE TEXT). Figure 19. Using the Crystal Oscillator SU01390 87LPC768 X2 X1 THE OSCILLATOR MUST BE CONFIGURED IN THE EXTERNAL CLOCK INPUT MODE. A CLOCK OUTPUT MAY BE OBTAINED ON THE X2 PIN BY SETTING THE ENCLK BIT IN THE P2M1 REGISTER. CMOS COMPATIBLE EXTERNAL OSCILLATOR SIGNAL Figure 20. Using an External Clock Input |
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