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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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S12OSCV2D 데이터시트(PDF) 106 Page - Freescale Semiconductor, Inc |
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S12OSCV2D 데이터시트(HTML) 106 Page - Freescale Semiconductor, Inc |
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106 / 126 page  MC9S12DJ64 Device User Guide — V01.17 106 A.5.1.5 Pseudo Stop and Wait Recovery The recovery from Pseudo STOP and Wait are essentially the same since the oscillator was not stopped in both modes. The controller can be woken up by internal or external interrupts. After twrs the CPU starts fetching the interrupt vector. A.5.2 Oscillator The device features an internal Colpitts and Pierce oscillator. The selection of Colpitts oscillator or Pierce oscillator/external clock depends on the XCLKS signal which is sampled during reset. Pierce oscillator/external clock mode allows the input of a square wave. Before asserting the oscillator to the internal system clocks the quality of the oscillation is checked for each start from either power-on, STOP or oscillator fail. tCQOUT specifies the maximum time before switching to the internal self clock mode after POR or STOP if a proper oscillation is not detected. The quality check also determines the minimum oscillator start-up time tUPOSC. The device also features a clock monitor. A Clock Monitor Failure is asserted if the frequency of the incoming clock signal is below the Assert Frequency fCMFA. Table A-15 Oscillator Characteristics Conditions are shown in Table A-4 unless otherwise noted Num C Rating Symbol Min Typ Max Unit 1a C Crystal oscillator range (Colpitts) fOSC 0.5 16 MHz 1b C Crystal oscillator range (Pierce) 1 fOSC 0.5 40 MHz 2 P Startup Current iOSC 100 µA 3 C Oscillator start-up time (Colpitts) tUPOSC 82 1003 ms 4 D Clock Quality check time-out tCQOUT 0.45 2.5 s 5 P Clock Monitor Failure Assert Frequency fCMFA 50 100 200 KHz 6P External square wave input frequency 4 fEXT 0.5 50 MHz 7 D External square wave pulse width low tEXTL 9.5 ns 8 D External square wave pulse width high tEXTH 9.5 ns 9 D External square wave rise time tEXTR 1ns 10 D External square wave fall time tEXTF 1ns 11 D Input Capacitance (EXTAL, XTAL pins) CIN 7pF 12 C DC Operating Bias in Colpitts Configuration on EXTAL Pin VDCBIAS 1.1 V 13 P EXTAL Pin Input High Voltage4 VIH,EXTAL 0.7*VDDPLL V T EXTAL Pin Input High Voltage4 VIH,EXTAL VDDPLL+ 0.3 V 14 P EXTAL Pin Input Low Voltage4 VIL,EXTAL 0.3*VDDPLL V T EXTAL Pin Input Low Voltage4 VIL,EXTAL VDDPLL - 0.3 V 15 C EXTAL Pin Input Hysteresis4 VHYS,EXTAL 250 mV |
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