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ST92196A bảng dữ liệu(PDF) 65 Page - STMicroelectronics |
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ST92196A bảng dữ liệu(HTML) 65 Page - STMicroelectronics |
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65 / 268 page  65/268 RESET AND CLOCK CONTROL UNIT (RCCU) 5.3 OSCILLATOR CHARACTERISTICS Because of the real time need of the application, it is assumed the ST92196A will be used with a 4 MHz crystal fed to the Core by the frequency mul- tiplier output after it is started and stabilized. 5.3.1 HALT State When a HALT instruction is processed, it stops the main crystal oscillator preventing any derived clock into the chip. Exit from the HALT state can be obtained through a main system reset. 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 28. Crystal Oscillator Table 13. Crystal Specification 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 table is relative to the fundamental quartz crys- tal only (not ceramic resonator). Figure 29. Internal Oscillator Schematic OSCIN OSCOUT CL1 CL2 ST9 CRYSTAL CLOCK VR02116A 1M* *Recommended for oscillator stability C1=C2=56pF C1=C2=47pF Rs max (ohm) 200 260 VR02086A HALT OSCIN OSCOUT RIN ROUT R |
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