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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92163 датащи(PDF) 80 Page - STMicroelectronics |
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ST92163 датащи(HTML) 80 Page - STMicroelectronics |
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80 / 224 page  80/224 ST92163 - RESET AND CLOCK CONTROL UNIT (RCCU) Figure 38. Example of Low Power Mode programming Begin WFI_CKSEL ← 1 WFI status User’s Program LPOWFI ← 1 User’s Program WFI End PROGRAM FLOW COMMENTS SYSTEM CLOCK FREQUENCY Interrupt Quartz not divided by 2 PLL multiply factor Multiplier divider’s factor set Wait for the CK_AF clock selected when WFI Wait For Interrupt No code is executed until Interrupt served fixed to 6. to 2, and PLL turned ON an interrupt is requested Low Power Mode enabled Main code execution continued 8 MHz 24 MHz 8 MHz 24 MHz ** T2 = Quartz oscillator start-up time *T1 = PLL lock-in time T1* T2** T1* FQ=8 MHz, Vcc=5 V and T=25°C RC WAIT DX2-0 ← 001 Xtal is selected to restart the PLL quickly CSU_CKSEL 1 PLL is system clock source CSU_CKSEL<- 1 while the CK_AF is the system clock CKAF_SEL <- 0 The system CK switches to Xtal The PLL is locked and becomes the system clock XTSTOP ← 0 To restart Xtal and PLL To stop PLL and Xtal when a WFI occurs XTSTOP ← 1 PLL locking SET UP AFTER RESET PHASE: DIV2 = 0 XTSTOP = 0 MX(1:0) = 01 CSU_CKSEL =0 Interrupt WAIT Routine (LOCK->1) oscillator RC oscillator |
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