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ST92141 数据表(PDF) 73 Page - STMicroelectronics |
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ST92141 数据表(HTML) 73 Page - STMicroelectronics |
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73 / 179 page  73/179 ST92141 - RESET AND CLOCK CONTROL UNIT (RCCU) 5.5 OSCILLATOR CHARACTERISTICS The on-chip oscillator circuit uses an inverting gate circuit with tri-state output. Notes: Owing to the Q factor required, Ceramic Resonators may not provide a reliable oscillator source. OSCOUT must not be directly used to drive exter- nal circuits. When the oscillator is stopped, OSCOUT goes high impedance. The parallel resistor, R, is disconnected and the oscillator is disabled, forcing the internal clock, CLOCK1, to a high level, and OSCOUT to a high impedance state. To exit the HALT condition and restart the oscilla- tor, an external RESET pulse is required. It should be noted that, if the Watchdog function is enabled, a HALT instruction will not disable the os- cillator. This to avoid stopping the Watchdog if a HALT code is executed in error. When this occurs, the CPU will be reset when the Watchdog times out or when an external reset is applied. Figure 34. Crystal Oscillator Table 17. Crystal Specification (5V) Legend: CL1, CL2: Maximum Total Capacitances on pins OSCIN and OSCOUT (the value includes the external capaci- tance tied to the pin CL1 and CL2 plus the parasitic capac- itance of the board and of the device). Note: The tables are relative to the fundamental quartz crystal only (not ceramic resonator). Figure 35. Internal Oscillator Schematic Figure 36. External Clock OSCIN OSCOUT CL1 CL2 ST9 CRYSTAL CLOCK VR02116A 1M* *Recommended for oscillator stability Rs max (ohm) CL1=CL2= 56pF CL1=CL2= 47pF CL1=CL2= 22pF Freq.= 3 MHz 270 350 850 Freq.= 4 MHz 150 200 510 Freq.= 5 MHz 110 120 340 VR02086A HALT OSCIN OSCOUT RIN ROUT R OSCIN OSCOUT CLOCK INPUT NC EXTERNAL CLOCK VR02116B ST9 1 |
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